<p>In Indonesia, sugarcane (<em>Saccharum officinarum </em>L.) is mostly cultivated in drylands, thus depending on rainfall for crop growth and development. Rainfall is an essential factor affecting sugarcane productivity. The global climate indices can be used to investigate potential of rainfall within a given area and its relationship with crop productivity. This reserach aimed to analyze the relationship between the global climate index, rainfall, and sugarcane productivity in drylands near Glenmore sugar mill, i.e., Benculuk and Jolondoro, Banyuwangi, East Java, Indonesia. The global climate index data used were the Southern Oscillation Index (SOI) and Sea Surface Temperature (SST) between 1995 and 2014. Results of this research showed that SOI and SST can be used to predict the rainfall in both Benculuk and Jolondoro. Rainfall (y) can be predicted with SST data (x) using the equation of y = -352.49x + 7724.1 in Benculuk and y = -107.32 + 3443.4 in Jolondoro, as well as with SOI data (x) using the equation of y = 38.664x + 1555.1 in Benculuk and y = 10.541x + 1567.8 in Jolondoro. Sugarcane productivity (y) in Jolondoro can be predicted using data of total rainfall (x) between October and March with the following equation: y = -0.1672x + 1157.3. This equation can be used by sugar mills, sugarcane growers, and other sugarcane-relevant stakeholders for determining the appropriate growing season.</p>

Sugarcane plantations in Indonesia are mainly grown on dry land with wide ranges of climatic conditions. This study aimed to present information about the average rainy season period and climate classification in each sugarcane development area in Indonesia. The rainy season period was determined based on early of the dry season and rainy season for 10 years from 2009-2018 in 67 Zone of Season (ZOM) of 342 ZOM issued by The Agency for Meteorology, Climatology and Geophysics of Indonesia. The rainy season period in sugarcane regions ranges from 20-25 ten day period in 59% of the zones in Sumatra, 15-20 ten day period in 73% of the zones in Java and Madura, 20-25 ten day period and 10-15 ten day period in 33% and 34% zones in Sulawesi, 12 ten day period in West Nusa Tenggara and 16-25 ten day period in Papua. Climate classification was also identified in each zone of sugarcane regions based on Oldeman classification map. Information about rainy season period and climate classification enables in the planning and production of crops for certain regions. Further studies on the prediction of water availability during sugarcane growth are needed.

<p>Salah satu wilayah pengembangan tanaman tebu lahan kering di Sulawesi Selatan terdapat di Kabupaten Bone dengan dua pabrik gula (PG) yaitu PG Bone dan PG Camming. Produktivitas tebu dan rendemen sangat berfluktuasi dan dipengaruhi oleh faktor iklim selain pengelolaan on farm. Dengan demikian potensi sumber daya iklim yang berpengaruh terhadap produktivitas tebu dan rendemen perlu diketahui. Analisis data iklim di Kabupaten Bone dilaksanakan mulai bulan Juni 2012 sampai Desember 2013. Data yang diperlukan terdiri atas curah hujan, suhu maksimum, suhu minimum, kelembapan, lama penyinaran, dan kecepatan angin yang terkumpul dari Dinas PU Pengairan Provinsi Sulawesi Selatan, PG Camming, dan PG Bone. Data produktivitas tebu dan rendemen diperoleh dari PG Camming dan PG Bone. Awal dan akhir musim hujan, peluang hujan, serta lama periode kering ditentukan berdasarkan metode Markov Chain First<br />Order Probability. Pola sebaran hujan ditentukan berdasarkan isohiet yang dibuat menggunakan program ArcGIS 9.03. Evapotranspirasi dihitung berdasarkan hasil analisis neraca air berdasarkan metode Penman-<br />Monteith menggunakan program CROPWAT 8.0. Sebaran curah hujan tahunan di Kabupaten Bone didominasi oleh pola hujan tahunan &gt;2.000 mm dan 1.500–2.000 mm dan sebagian kecil wilayah Timur dengan curah hujan tahunan &lt;1.000 mm. Tingginya curah hujan yang berlangsung sepanjang tahun menyebabkan rata-rata periode hari kering relatif pendek yaitu 66–92 hari. Evapotranspirasi potensial di wilayah PG Camming berkisar 1.268–1.288 mm sehingga potensi curah hujan dapat memenuhi kebutuhan air tanaman tebu. Tekstur tanah di sebagian besar wilayah pengembangan tebu di Bone adalah tekstur berat dan drainase lahan jelek maka potensi lahan tergenang cukup tinggi. Dengan potensi sumber daya iklim tersebut mengindikasikan bahwa di sebagian besar wilayah PG Bone dan PG Camming optimasi masa tanam sangat penting dan menggunakan varietas tebu masak awal yang tahan kelebihan air terutama pada wilayah dengan curah hujan &gt;2.000 mm/tahun. Selain itu perlu ditunjang dengan usaha memanen air hujan yang melimpah dan perbaikan drainase. Waktu tanam yang optimum adalah tengah bulan pertama Oktober sampai tengah bulan pertama November (10A–11A) di wilayah PG Camming dan tengah bulan pertama November (11A) di wilayah PG Bone.</p><p> </p><p>One of sugar cane cultivation area of dry land in South Sulawesi  concentrated in Bone regency with two sugar mills (Bone and Camming). The productivity of sugar cane and sugar are fluctuated and mostly caused<br />by climatic factors. Therefore, climate resources in Bone regency that influence sugar cane growth and yield need to be evaluated. Analysis of climate data in Bone regency was conducted from June 2012 up to December 2013 based on the data of rainfall, maximum temperature, minimum temperature, humidity, sun shine duration, and wind speed collected from the Department of Irrigation Works South Sulawesi Province, Camming and Bone Sugar Mills. Cane and sugar production were collected from Camming and Bone Sugar Mills. The onset and end of rainy season, length of dryspell, and rainfall probability were analysed by The Markov<br />Chain First Order Probability Method. Rainfall pattern was determined by using isohiet. Evapotranspiration was calculated by water balance analysis. Rainfall pattern in Bone was dominated by annual rainfall pattern &gt;2,000 mm and 1,500–2,000 mm, eastern part of Bone has annual rainfall pattern &lt;1,000 mm. The high rainfall that lasted throughout the year resulted in relatively short average dry day (66–92 days). Potential evapotranspiration in the region of Camming Sugar Mill ranges from 1,268 to 1,288 mm so the annual rainfall can meet crop water requirement of sugar cane. Heavy soil texture and bad soil drainage in Bone regions resulted in flooded land. Based on climate resources, it indicates that in most areas of the Bone and Camming Sugar Mills optimization of planting time is critical, use of sugar cane varieties with early maturity and resistant to excess water, and effort to harvest the abundant rainwater especially in areas with rainfall &gt;2000<br />mm/year, and improvement in drainage system. Optimum planting season in Camming Sugar Mill is the first half of October to second half of  November (10A–11A) and the first half of November (11A) in Bone Sugar<br />Mill.</p>

<p>Tujuan utama pemuliaan kapas di Indonesia adalah meningkatkan produktivitas dan kualitas serat dalam upaya meningkatkan pendapatan petani dan memperbaiki mutu benang tcnun seta kualitas tekstil yang harus bersaing di pasar internasional. Scjumlah enam persilangan telah dilakukan antara dua varietas dai India. I.RA 5166 dan SRT-1 dengan dua varietas dai Amerika Serikat, Dcltapine 55 dan Deltapinc Acala 90 dan satu vaietas dai Australia, Siokra. Seleksi individu, seleksi galur dan seleksi individu dalam galur dilaksanakan pada generasi F2 sampai F5 berdasarkan jumlah buah, tingkat kerusakan daun terhadap Sundapteryx biguttula. dan mutu serat; semua proses di atas dilakukan pada kondisi lahan tadah hujan, dan tanpa penggunaan insektisida terhadap tanaman; dari proses di atas diperoleh 12 galur harapan. Sejumlah 13 percobaan dilakukan antara tahun 1993 sampai dengan 2001 untuk mengamati kcragaan galur-galur baru tersebut; pengujian dilakukan di Jawa Timur dan Sulawesi Selatan, menggunakan teknik-teknik penelitian standar. Dengan proscdur ini dapat diidcntifikasi beberapa galur yang menunjuk¬ kan perbaikan serenlak hasil dan kualitas serat kapas. Beberapa penelitian juga dilakukan untuk mcngcvaluasi tanggap galur-galur tersebut pada tumpangsari dengan kedelai dan kacang hijau di Jawa Timur. Dua galur, 88003/16/2 dan 92016/6 (sudah dilepas dengan nama vaietas Kanesia 8 dan Kanesia 9 pada bulan Juni 2003), menunjukkan produktivitas dan kualitas serai yang lebih linggi. Rata-rata, kedua vaietas menghasilkan 1.85 ton dan 191 ton kapas berbiji per hektar atau 8-12% lebih tinggi dai hasil vaietas Kanesia 7 yang sudah dilepas sebelumnya. Persentase serat 35.2%, kekuatan serat berkisar antara 22.6-24.7 gram tex'1, serat lebih panjang dan berkisar 29.2-30.3 mm sedangkan angka mikroncr lebih rendah yang menyatakan bahwa serat lebih halus. Semua perbaikan di atas menunjukkan perbaikan mutu serat. Kanesia 8 dan Kanesia 9 juga menunjukkan peningkatan ketahanan terhadap Sundapteryx biguttula dan komplcks hama kapas. Kanesia 8 dan Kanesia 9 kurang kompctitif dalam tumpang sari dengan kedelai jika dibandingkan dengan Kanesia 7. Pada tumpang sari dengan kacang hijau Kanesia 8 juga mengalami kehilangan hasil yang tinggi, sedangkan Kanesia 9 menunjukkan toleransi yang tinggi dalam kompctisi dengan kacang hijau. Pelepasan Kanesia 8 dan Kanesia 9 akan memberikan pilihan varietas yang lebih banyak bagi petani dan perusahaan pemintalan untuk menyesuaikan dengan produk akhirnya.</p><p>Kata kunci : Gossypium hirsutum, prosedur pemuliaan, produktivitas, kualitas serat, Sundapteryx biguttula, tumpangsari</p><p> </p><p><strong>ABSTRACT </strong></p><p><strong>Genetic improvement on two new cotton varieties, Kanesia 8 and Kanesia 9</strong></p><p>The main objective of cotton breeding in Indonesia is to improve productivity and fiber quality which is aimed to increase farmers' income and to make beter yam and textile quality that has to compete in international market Six crosses were made between two Indian varieties, LRA 5166 and SRT-1 with two USA vaieties, Deltapine 55 and Deltapinc Acala 90 and one Australian variety, Siokra. Individual plants, lines and individual within lines were selected on F2-F5 generations based on boll- counts, leaf-damage by jassids and fiber traits, those were conducted under rainfed and insecticide-ree condition; twelve promising lines were produced from this process. A total of 13 trials were carried out to observe performance of these new lines during 1993 to 2001; those were located in East Java and South Sulawesi using the standardized experimental techniques. By these procedures make it possible to identify several breeding lines showing simultaneous improvement in yield and fiber quality. Several tests were also made to evaluate response of those lines under intercropping with soybean and mungbean, which were located in East Java. Two breeding lines, 88003/16/2 and 92016/6 (those have been released as Kanesia 8 and Kanesia 9 in 2003), showed higher productivity and fiber quality. In average, these new vaieties produced 1.85 and 1.91 ton ha'1 seed cotton respectively or 8 to 12% higher than those on Kanesia 7, the previously released vaiety. Lint turn-out was 35.2% fiber-strength was varied from 22.6 to 24.7 gram tex'1 , fiber lengths ranged from 29.2 to 30.3 mm with lower micronaire-valucs indicating better fiber-ineness. All of those improvements represented a trend toward a higher quality iber. Kanesia 8 and Kanesia 9 also showed a slight improvement in resistance to jasssids and insect pest-complex. Kanesia 8 and Kanesia 9 performed lower competitive ability under intercropping with soybean in comparison with Kanesia 7. Under intercropping with mungbean Kanesia 8 also suffered high yield loss, wherein Kanesia 9 showed good tolerance to mungbean. The release of Kanesia 8 and Kanesia 9 is expected to give a broader choice for the cotton growers and spinning-mills to match with their inal product.</p><p>Key words: Coton (Gossypium hirsutum), breeding procedure, productivity, liber quality, Sundapteryx bigullul. inter¬ cropping.</p>

<p>Dalam mendukung pencapaian swasembada gula, Pulau Madura menjadi salah satu sasaran lokasi pengembangan tebu. Di Kabupaten Sampang pengembangan usaha tani tebu dimulai sejak tahun 2009. Program ini<br />didukung oleh masuknya perusahaan perkebunan serta bantuan penganggaran dari APBN. Penelitian bertujuan mengetahui kelayakan secara sosial dan ekonomi serta potensi pengembangan usaha tani tebu ke depan dan untuk mengetahui peluang dari usaha tani tebu ini bagi masyarakat di Pulau Madura secara umum.  Penelitian dilaksanakan mulai September sampai Desember 2013 di lokasi-lokasi kecamatan pengembangan tebu Kabupaten Sampang. Informasi dikumpulkan dengan memanfaatkan data sekunder dan data primer melalui wawancara dengan individu maupun grup/kelompok masyarakat, dinas/institusi terkait. Data dianalisa menggunakan analisis deskriptif untuk memperoleh gambaran kondisi yang dihadapi dan pemecahan dari masalah yang dihadapi di wilayah yang diamati. Analisis aspek usaha tani meliputi data input-output komoditas existing dengan analisis finansial. Untuk melihat kelayakan usaha tani digunakan R/C Ratio. Hasil penelitian menunjukkan bahwa faktor-faktor yang mempengaruhi kelayakan usaha tani tebu adalah kepemilikan lahan, insentif rangsangan dana bantuan sosial (Bansos) APBN dan subsidi pengembangan Tebu Madura (Dinas Perkebunan Provinsi), serta kerja sama kemitraaan dengan pabrik gula (PTPN X) yang menawarkan bantuan modal, subsidi saprotan, alat/mesin pertanian, serta jaminan pasar. Kemitraan yang telah ada antara PTPN X dengan petani tebu di Sampang dapat dikategorikan dalam tipe kemitraan subkontrak dan layak diteruskan.  Skema yang sudah diterapkan dalam kontrak ini adalah pola kemitraan antara pemerintah daerah, swasta (PTPN X), dan petani tebu. Usaha tani tebu dengan R/C ratio sebesar 1,05 dan 1,68 dan pendapatan bersih Rp1.358.920,00/ha dan Rp14.024.360,00/ha pada usaha tani tebu awal dan tebu kepras I, membuktikan usaha tani tebu di lokasi penelitian sangat layak untuk diusahakan dan menguntungkan. Selain peluang bagi masyarakat memanfaatkan potensi lahan tidur dan sub-optimal untuk pengembangan usaha tani tebu yang memberikan manfaat ekonomi bagi masyarakat di Kabupaten Sampang.</p><p> </p><p>In order to achieve self-sufficient in sugar consumption, the Madura Island became one of the targets of sugar cane development area. In Sampang Regency, the development of sugar cane agribusiness have been started since 2009. This program was supported by the companies as well as financial supported from national budget (APBN). The study aims to determine the feasibility of social and economic as well as the potential<br />for future development of sugar cane farming and to understand the opportunities of the farming for community in Madura Island on the whole. The study was conducted from September to December 2013 at 14 districts of sugar cane developing area in Sampang. Information was collected by using secondary data and primary data through interviews with individual and group/community groups, agencies/institutions concerned.  Data were analyzed using descriptive analysis to obtain a description of the conditions encountered and the solving of problems encountered in the observed region. The analysis covers aspects of farm commodity input-output data with the existing financial analysis. To look at the feasibility of farming used the R/C ratio. The results of the study showed that some factors which influenced the farmer to plant the cane were: land ownership; the stimuli of incentives from social grants (Bansos) from APBN and subsidy from project<br />development (from Provincial Agricultural office); the cooperation of partners through sugar company (PTPN X) which offered grants, input subsidy, equipments/agriculture machinery as well as market assurance. The partnership among PTPN X and the sugar cane farmers in Sampang was feasible and categorized a subcontract partnership type. Meanwhile, the scheme that had been implemented in this type of contract was the<br />partnership pattern between local government, private (PTPN X) and the sugar cane farmers. The sugar cane farming with R/C ratio of 1.05 and 1.68, or net income recieved of Rp1,358,920/ha and Rp14,024,360/ha at<br />the first harvested and second period harvested, proving that the farming in the study area is feasible to carry on and profitable. In addition, it is the opportunities to develop the potential of the unused and suboptial<br />land for sugar cane agribusiness development that provides economic benefits to the community in Sampang Regency.</p>

A field experiment was conducted at Kediri, East Java, to examine the influence of row spacing on the yield of five promising clones from August 2018-June 2020. The investigation was of a Split-Plot design with three replications. The main plot consisted of three planting arrangements: SR, single row spacing at 110 cm, DR1, double rows spacing 50+135 cm, and DR2, double rows spacing 50+170 cm. Sub-plots consisted of five promising clones and one check variety: MLG 5, MLG 9, MLG 14, MLG 52, MLG 55, and PS 881. The results suggest no overall significant effect of planting arrangement on sugar yield, though clones may vary. There are significant differences in yield between some clones. Wider rows, DR2, show the highest yield in tonnes of cane per hectare (TCH) in PC (153.94 t/ha) with a slight decrease (14%) in RC-1 due to reduced plant population. Sugar yield in tonnes of sugar per hectare (TSH) in various planting arrangements ranges from 12.26-13.99 t/ha in PC and 10.68-11.93 t/ha in RC-1. MLG 9 can be released as a new variety with high cane and sugar yields.

Newly released sugarcane varieties need to be adapted to various environments. This research was aimed at examining the growth and yield potential of newly released varieties of sugarcane in the first year as plant cane (PC) and the second year as first ratoon cane (RC1) on dry land. The research was carried out at Wedarijaksa station, Trangkil Sugar Mill area, Pati, Central Java in 2019–2021. Four sugarcane varieties were grown using a double rows system, AAS Agribun, ASA Agribun, AMS Agribun, and CMG Agribun and one commercial variety, PSJK 922. Measurements of crop growth were made periodically: yield components at harvest in PC-RC1, and physiological characteristics 5 months after planting. The results indicate that mean tonnes of cane and sugar per hectare between PC and RC1 decreased by 22.7% and 21.0%, respectively, for AAS Agribun, ASA Agribun, and CMG Agribun due to decreased stem weights. AMS Agribun showed the smallest decrease in tonnes of cane (4%) and increase in tonnes of sugar per hectare (2%) from PC to RC1. The highest number of tonnes of sugar in PC was achieved by ASA Agribun (12.8 t ha−1), slightly above PSJK 922 (12.69 t ha−1). The decline in tonnes of cane and sugar needs to be reduced by the continuously improving cultivation techniques. The mean photosynthetic water use efficiency of tested new varieties was 7.46 µmol CO2 mol H2O−1. These research findings provide information on crop performance and can be used as a basis for selecting varieties to be developed in the region. Further studies will be required to test these new sugarcane varieties in a wide range of agroecological zones in Indonesia.

<p>Penelitian pengaturan kerapalan galur harapan kapas pada sistem tumpangsari dengan kedelai dilakukan di IPPTP Mojosari, Mojokerto, Jawa Timur pada lahan sawah sesudah padi dari bulan Mei sampai dengan Oktobcr 2000. Tujuan penelitian untuk mendapatkan kerapalan lanaman yang sesuai pada galur harapan kapas pada sistem tumpangsari dengan kedelai Percobaan disusun dalam rancangan petak tcrbagi dengan 4 varictas'galur (92016/6, 91001 29 2, 88003/16/2 dan Kanesia 7) sebagai pelak utama Anak petak terdiri atas 3 tata tanam yaitu (1) tala tanam 1(1); 3, yaitu I bans kapas (I tan 'lubang) dan 3 bais kedelai, (2) tata tanam 2 (1) 4 yaitu 2 baris kapas(l tan.'lubang) dan 4 baris kedelai, (3) tata tanam 1 (2)3 yaitu 1 baris (2 tan 'lubang dan 3 bais kedelai) Jarak lanam kapas dan kedelai pada (ala tanam 1(1) 3 adalah 150 x 20 cm dan 25 x 20 cm, pada tata tanam 2( I ):4 adalah 150 (60) cm x 30 cm dan 20 cm x 20 cm, dan tata tanam 1 (2) 3 adalah 150 cm x 30 cm dan 25 cm x 20 cm Hasil penelitian menunjukkan bahwa lata tanam yang sesuai pada galur varietas baru kapas adalah tata tanam 1(1)3 |1 baris kapas (1 tan lubang) dan tiga baris kedelai] Mengurangi jumlah lanaman kapas tiap lubang dari 2 menjadi I lanaman pada tata tanam 1 (2)3 (1 baris kapas (2 lan lubang) dan 3 bais kedelai) meningkatkan eisiensi fotosintcsis dai 59 x 10 menjadi 9.4 x 10"" mgC02.mgll20 sehingga produksi kapas meningkat dari 1 167 2 menjadi I 251 6 kgha, sedangkan produksi kedelai tidak berpengaruh yaitu rata-rata 846 kgha Apabila dialur dalam sistem 2:4 (2 baris kapas diantara 4 baris kedelai), maka eisiensi fotosintcsis hanya meningkat dari 5.9 x \0A menjadi 77 x 10 mg C02mg H20 sehingga produksi kapas hanya meningkat dari I 167 2 menjadi I 206 2 kgha Pada kedua sistem lanam tersebut produktivitas galur 8800316/2 (1 323.3 kgha) lidak berbeda dengan Kanesia 7 (I 365.2 kg/ha) dan nyata lebih tinggi daripada galur 920166 (1 096 9 kgha) maupun 91001.29/2 (1 048 0 kgha).</p><p>Kata kunci: Gossypium hirsutum. kapas. Glycine Max, kedelai, kerapatan lanaman, tumpangsari, hasil</p><p> </p><p><strong>ABSTRACT</strong></p><p><strong>Density of neyv cotton lines under intercropping system with soybean</strong></p><p>The ield trial on different crop densities for new cotton lines under intercropping system with soybean was conducted in Mojosari. East Java from May lo October 2000 on the rice ield ater harvest. The purpose of the study was to investigate die optimum population for new cotton lines under intercropping with soybean The field experiment was arranged in a Split Plot Design with three replications. Pour new cotton lines were allocated lo main plots 92016 6, 91001/29.2 (okra leal). 88003/16/2 and Kanesia 7 'Three crop arrangements were allocated to sub-plots: 1 (1 ):3 [1 cotton row (I plant/hole) in between 3 rows of soybean), 2(1 ):4 [ 2 coton rows (1 plant/hole) in between 4 rows of soybean, and 1(2):3 (1 cotton row (2 planlholc) in between 3 rows of soybean). Two replications for sole crops of cotton and soybean were included in this expeiment lo compare both cropping systems. Research showed that by keeping one cotton plant/hole under intercropping system wi(h soybean in arrangement of 1:3 11 conon row in between 3 rows of soybean), increased the photosynthetic efficiency from 5 9 x 10"* to 9.4 x 10"* mg C02/mg H20, causing cotton yield increased from 1167.2 to 1 251.6 kg/ha; however soybean yield did not differ between different propotions of cotton and soybean (846 kg/ha) Under arrangement of Iwo cotton rows * four rows of soybean, the photosynthetic efficiency increased from 5.9 x 10"1 to 7.7 x 10"* mg COj'mg HjO resulted in increased cotton yield from I 167.2 lo 1 206.2 kgha Ihe yield of line 88003/16 2 (1 323.3 kgha) did not differ with that on Kanesia 7 (I 365.2 kg/ha); both were higher than those on 92016/6 (1 096.9 kg/ha) and 91001 /29/2 (1 048.0 kgha).</p><p>Key words: Gossypium hirsutum, kapas. Glycine Max, soybean, crop density, intercropping, yield</p>