<p>ABSTRACT</p><p>Increasing in fertilizer price  has caused  increase  in hydroponic system cost. The  objective of the  research  was  to  determine  the  best  fertilizer  source that  could  replace  AB  mix  by  examining several  sources  of  nutrients, i.e. NPK  15:15:15,  NPK  12:14:12  for  hydroponic  cultivation  of spinach, pakchoy,  and  lettuce.  The  research  was  conducted  in  the  Green  House Dramaga  Field Unit,  University  Farm,  IPB  Bogor  from  February  to  April 2013. The  treatments  (AB  mix,  NPK 15:15:15,  and  NPK  12:14:12)  were arranged  in  randomized  completely  blok  design  with  4 replications. The results showed that fertilizer treatments used did not affect the vegetative growth of spinach,  pakchoy,  and  lettuce,  but  AB  mix  fertilizer  treatment gave  the  highest  yield  in  spinachplants,  pakchoy,  and  lettuce  in  yield components  i.e.  an  average  weight/plant  and  weight  ofmarketable yield, respectively  at  21.65 g,  235.75 g  spinach,  46.06  g,  465.75  g  pakchoy, and 25.93  g lettuce.  In  lettuce  experiment,  no  marketable  yield  was obtained.  Based  on  these  results  NPK15:15:15  and  NPK  12:14:12 fertilizer could not replace  AB  mix  as a  source of plant nutrients inspinach, pakchoy, and hydroponic lettuce.</p><p>Key words: AB mix, hydroponic , leafy vegetables , NPK 15:15:15, NPK 12:14:12</p><p> </p><p>ABSTRAK</p><p>Kenaikan harga pupuk menyebabkan kenaikan  biaya  dalam sistem hidroponik. Penelitian ini bertujuan  untuk  mendapatkan  hara  yang  dapat   menggantikan AB  mix  dengan  cara  menguji beberapa  sumber  hara,  yaitu  NPK  15:15:15, NPK  12:14:12  pada  budidaya  bayam,  pakchoy,  dan selada  secara hidroponik.  Percobaan  dilaksanakan  di  Green  House  Unit  Lapangan Dramaga, University Farm, IPB Dramaga Bogor, dari Februari sampai April 2013. Rancangan percobaan yang digunakan adalah Rancangan Kelompok Lengkap Teracak dengan menggunakan tiga perlakuan: AB mix,  NPK 15:15:15, dan  NPK  12:14:12  dengan  4  ulangan.  Hasil  penelitian  menunjukkan bahwa pupuk  tidak  mempengaruhi  pertumbuhan  vegetatif  tanaman  bayam, pakchoy,  dan  selada,  tetapiperlakuan  pupuk AB mix memberikan hasil produksi tertinggi pada tanaman bayam, pakchoy, dan selada yaitu pada komponen hasil panen rata-rata bobot  tanaman-1dan bobot layak pasar, berturutturut sebesar 21.65  g,  235.75  g tanaman bayam, 46.06 g,  465.75  g tanaman pakchoy dan  25.93  g tanaman  selada.  Pada  percobaan  selada tidak  diperoleh  hasil  yang  dapat  dipasarkan.  Berdasarkan hasil penelitian tersebut pupuk NPK 15:15:15 dan NPK 12:14:12 tidak dapat menggantikan pupuk AB mix sebagai sumber hara pada tanaman bayam, pakchoy, dan selada secara hidroponik.</p><p>Kata kunci: AB mix, hidroponik, sayuran daun, NPK 15:15:15, NPK 12:14:12</p>

<p>ABSTRACT</p><p><br />Shallot is one of important commodity besides chili and potatoes. Shallot is cultivated on dry land. The dry land used in Indonesia is still relatively small, while the potential of this area is considered large for the development of agriculture. Pressurized irrigation system has the advantage of efficient use of water making it suitable to be applied on dry land. The study consisted of two experiments, the effect of irrigation volume and frequency of irrigation influence on the growth of shallot. The research was conducted at the Experimental Station Teaching Farm and Postharvest Laboratory Department of Agronomy and Horticulture, Bogor Agricultural University from October 2014 to April 2015. The research consisted of two experiments by using a Randomized Block Design with four replications. The treatment in the first experiment was percentage of the volume of irrigation water consisting of five levels (S100% ETc, S75% ETc, S50% ETc, S25% ETc (with sprinkler) and 100% ETc conventional (without sprinkler). The treatment in the second experiment was frequency of irrigation consisting of four levels (two times a day, once a day, once in two days one and once in three days). Results of the first experiment showed the plants could grow<br />and produced up to S25% ETc or 81.17% water available for evapotranspiration, but the best treatment was S100% ETc volume irrigation, based on yields. Watering with sprinkler irrigation provided better effect than manual watering which was usually done by farmers. The second eperiment showed that the best watering frequency for vegetative growth was once a day while for total yield was twice a day.</p><p>Key words: dryland, irrigation, shallot, sprinkler, total yield, vegetative growth,</p><p>ABSTRAK</p><p><br />Bawang merah salah satu komoditas unggulan nasional selain cabai dan kentang. Budidaya bawang merah umumnya dilakukan pada lahan kering dan membutuhkan irigasi. Sistem irigasi bertekanan memiliki keunggulan dalam efisiensi penggunaan air sehingga cocok untuk diterapkan<br />pada lahan kering. Penelitian terdiri atas dua percobaan, yaitu pengaruh volume irigasi dan pengaruh frekuensi irigasi terhadap pertumbuhan dan produksi bawang merah. Penelitian ini dilaksanakan di Kebun Percobaan Teaching Farm dan Laboratorium Pascapanen Departemen Agronomi dan<br />Hortikultura, Institut Pertanian Bogor dari Oktober 2014 sampai April 2015. Penelitian terdiri atas dua percobaan menggunakan Rancangan Acak Kelompok dengan empat ulangan. Perlakuan pada percobaan 1 adalah persentase volume air irigasi terdiri atas 5 taraf (S100% ETc, S75% ETc, S50% ETc, S25% ETc (dengan sprinkler) dan konvensional 100% ETc (tanpa sprinkler), sedangkan perlakuan pada percobaan 2 adalah frekuensi irigasi terdiri atas 4 taraf yaitu dua kali sehari, satu kali sehari, dua hari sekali, tiga hari sekali. Hasil percobaan menunjukkan tanaman masih dapat tumbuh dan berproduksi sampai volume irigasi S25% ETc atau 81.17% air tesedia sudah dievapotranspirasikan oleh tanaman, tetapi perlakuan terbaik ialah volume irigasi S100% ETc berdasarkan bobot panen total. Penyiraman dengan irigasi sprinkler memberikan efek yang sama bahkan lebih baik dibanding penyiraman secara manual yang biasa dilakukan oleh petani. Frekuensi penyiraman terbaik untuk pertumbuhan vegetatif adalah satu kali sehari sementara untuk bobot panen total adalah dua kali sehari.</p><p>Kata kunci: bawang merah, hasil total, irigasi, lahan kering, pertumbuhan vegetatif, sprinkler</p>

<p style="text-align: justify;">The objectives of this researchwasto determine the effect of growing media composition on growth and production of two varieties of tomatoes in a hydroponic system. The research used Randomized Complate Block Design (RCBD) with two factors, they were tomato varieties and growing media composition. The tomato varieties were (Arthaloka, Permata) and growing media compotition were 100% husk (v/v), 75% husk + 25% bamboo leaves compost (v/v), 50% husks + 50% bamboo leaves compost (v/v), 25% husk + 75% bamboo leaves compost (v/v), and 100% bamboo leaves compost (v/v). Permata variety better than Arthaloka variety, based the higher number of flower and flower bunches, number of fruit, weight of fruit and grade of fruit. Bamboo leaves compost increased heigh of plant at 2-5 week after transplanting (WAT), number of leaves at 2-4 WAT, number of flower at 4-5 WAT, and 7-8 WAT, and number of flowers bunches at 5–11 WAT. The used of bamboo leaf compost 50% (v/v) and 75% (v/v) increased fruit number of tomato Permata variety at 7 WAT.</p><p>Keywords: rice husk, bamboo leaf compost, hydroponics, tomato production</p>

<p>ABSTRACT</p><p><br />The objectives of this research was to study the effect of shade on growth and productivity of several indigenous vegetables. The research was conducted at Vegetable Garden, University Farm IPB, Darmaga from February until June 2009. This research was arranged in a Randomized Completely Block Design, 1 factor with 2 treatments, shading (N1) and no shading (N0). Result of the research showed that shading increased plant height, length of branch, leaf length and width of Daun Ginseng (Talinum triangulare); leaf diameter, leaf length and width, petiole length of Sambung Nyawa (Gynura procumbens); leaf length and width of Katuk ( Sauropus androgynus); leaf number of Kenikir (Cosmos caudatus), stem diameter of Kemangi (Ocimum americanum); plant height, length of branch, number of branch, leaf length and width of Pohpohan (Pilea trinervia). Shading also increased total fresh and dry weight/plant of Daun Ginseng; and total fresh/plant of Sambung Nyawa and Pohpohan plants. Productivity of Daun Ginseng and Pohpohan at shade field was better than at open field. Daun Ginseng, Sambung Nyawa, Kenikir, Kemangi and Pohpohan plants prefered growing at low light intensity (shade <br />plants).</p><p><br />Key words: indigenous vegetable, shading, growth, productivity</p>

Yellow leaf curl disease of chili pepper caused by Pepper yellow leaf curl virus (PYLCV) has been reported as an important disease in Java and Bali. Disease severity reached 80−100% and it may cause significant yield losses. In order to reduce the negative impact of synthetic insecticides, silica application was evaluated for its potency to suppress the disease. A greenhouse experiment was conducted using randomly block design with 2 factors: PYLCV isolate (Java and Bali) and silica (SiO2) treatment (with and without). Parameters observed were disease symptoms, incubation period, disease incidence and severity, and total silica level. The symptoms of virus infection in Pelita 8 and Seret cultivars were yellow mosaic, leaf curl, green mosaic, dwarf, and cupping upward or downward. A Specific DNA fragment of 912 bp was successfully amplified from 4 samples. Four sequences were obtained and further analysis showed their highest homology, i.e. 96% and 97% with Pepper yellow leaf curl Indonesia virus-Java (PYLCIV-Java) (JX416180) and PYLCIV-KrthAl (LC381274), respectively. Infection by different virus isolates did not affect disease severity significantly. The application of silica was able to delay symptom development and to suppress the severity of the disease in the range of 16.67−30.33%. Silica application on the soil increased the total content of silica in the plants. However, a further experiment is required to understand the mode of action of silica in inducing plant resistance to the pathogen.

<p>Penentuan status hara dengan analisis jaringan daun pada tanaman jeruk lebih tepat menggambarkan konsentrasi hara yang berhubungan dengan perubahan produksi. Penelitian bertujuan menetapkan daun yang tepat untuk diagnosis status hara N, P, dan K pada tanaman jeruk pamelo. Survei dilaksanakan di lahan petani jeruk pamelo Pangkep pada Bulan Maret sampai Juni 2012 dengan ketinggian tempat 17–35 m dpl., dan analisis kimia di Laboratorium Tanah Balai Pengkajian Teknologi Pertanian Sulawesi Selatan. Penelitian menggunakan 150 pohon tanaman jeruk produktif yang berumur 5–8 tahun dengan pengelolaan yang relatif seragam. Pengambilan sampel daun ketiga-empat dan kelima-enam dari terminal dengan posisi cabang bagian atas dilakukan setelah panen. Analisis daun dilakukan dengan metode semi-mikro Kjeldahl untuk N, Spectrophotometer UV-VIS untuk P, dan Flamephotometer untuk K di Laboratorium Tanah BPTP Sulawesi Selatan. Hasil penelitian menunjukkan bahwa daun ketiga-empat memiliki korelasi terbaik dengan hasil serta mengandung konsentrasi hara N rendah (1,15–1,38%), P sedang (0,11–0,20%), dan K tinggi (2,31–2,94%). Konsentrasi N, P, dan K optimum dengan produksi relatif 85% masing-masing sebesar 1,77, 0,16, dan 1,67%. Hubungan konsentrasi hara dengan umur tanaman menunjukkan korelasi yang lemah tetapi rasio daun per buah yang tinggi menunjukkan konsentrasi hara N, P, dan K yang menurun, baik daun ketiga-empat maupun kelima-enam. Hasil penelitian ini dapat digunakan sebagai pedoman dalam menyusun rekomendasi pemupukan untuk tanaman jeruk pamelo.</p>

Planting multifunctional trees (e.g., fruit species) in cities can promote genetic conservation, economic activity, ecosystem services, and social cohesion. However, in Indonesia, the relationship between the abundance of fruit tree species and different city characteristics, including their involvement in the national smart city project, is still unknown. In this study, published reports and field surveys were used to evaluate the fruit tree distribution and its relationship with the characteristics of 224 of 514 Indonesian cities in order to identify tree species for multifunctional city greenery. This is the first study on the distribution of fruit tree species at the national level. The study identified 151 fruit species of 90 genera and 40 families, including large-sized fruits, such as avocados, breadfruit, coconuts, durians, jackfruit, and mangos. On average, cities contained 54 tree species, of which 21 (38.9%) were fruit trees. These findings indicate that cities are important contributors to the genetic conservation of local fruit trees, which can be further evaluated as new city greenery. However, a city’s involvement in the smart city project bore no relationship (p > 0.05) with the number of identified fruit species. Conversely, non-fruit species tended to be more diverse in smart cities. Since the presence of fruit species is associated with the city population, geographic position, climate, altitude, and attitude towards the fragility of sustainable conservation, introducing and maintaining these species as city greenery requires advocacy to city stakeholders.

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