No abstract

The study was expected to provide information poly ethylene glycol (PEG) concentration that can be used for plant breeding base rice (Oryza sativa L.) plant. The research was conducted covering two experimentals stage, were (i). Tests of dry stress resistance of six cultivars of rice using PEG 6000, and (ii). Emerged test seeds of six rice cultivars that have been subjected to dry stress with PEG 6000. The treatments were designed based on a complete randomized design of two factors. The first factor used six cultivars of rice were cv.Mekongga, cv. Way Apo Buru, cv. Sidenuk, cv. Pepe, cv. Ciherang and cv. IR64. and the second factor was dry stress [(0, 5, 10 and 15) % of PEG] with replicates three times. The higher concentration of PEG lowered growth rate (GR), emergence rate (ER), germination energy (GE) and the relative germination rate on all cultivars of rice. Germinate the longer time, appropriate concentrations of PEG. Test of pre-emergence on soil giving the mixed response on all cultivars of rice and PEG level. Cv. Mekongga, cv. Sidenuk, cv. Pepe and cv. Ciherang have the ability to grow on soil test. Canopy and root length highest on cv. IR64. Cv. Sidenuk popularity score can be classified moderate tolerance, while cv. Pepe that was sensitive to drought stress.

No abstract

The objective of this research is to assess the growth and physiological characteristics of lettuce in the delivery of different N-organics. Research was conducted at Faculty of Animal and Agricultural Sciences, Diponegoro University, Indonesia. The materials used were seeds of lettuce (Lettuce sativa L) on Oxisol soil types, with the total N content of 0.18 %, P (18 mg. g -1 ), K (23 mg. g -1 ) and C (1.52 %) were utilized. The organic fertilizers applied were cow-, sheep-, and guano manures, and compost and green manure (Leucaena leucocephala). The experimental design was a randomized block design with four replications and five treatments. The treatment dose of fertilizer applied is equivalent to 100 kg N / ha, namely: cow-manure ; sheep-manure; guano manure ; compost and green manure. Green manure, set into the ground is Leucaena leucocephala. The variables measured were the number of leaves, leaf area, leaf area index(LAI), the rate of photosynthesis, Chlorophyll total, anti-oxidant activity, fresh weight of lettuce per plot. The data obtained were analyzed using an ANOVA followed by the Duncan test. Guano fertilizer provided the most excellent effect on leaves, LAI, the rate of photosynthesis and biomass lettuce. Fertilizers derived from animal manure (guano, cattle, goats) gave a more excellent effect on the rate of photosynthesis of plants. Compost origin gave the lowest effect on leaf area, LAI, and the rate of photosynthesis. The number of leaves, total chlorophyll, and antioxidant content were not influenced by the different organic N fertilizers.

The research aim was to investigate association selected rhizobium bacteria with legumes in salinity stress. Plant media was salin soil that have EC = 20.45 mmhos/cm which taken from Morosari beach, Sayung, Demak. Rhizobium isolate applied was tolerant to 12.000 ppm of NaCl that equaled to electrical conductivity of 20 mmhos/cm. The research was carried out in green house of Laboratory of Forage Science Diponegoro University Semarang. The design arranged was completely randomized design with factorial design 2 x 4 in 3 repeatations. First factor was kind of legumes, T1 = lamtoro (Leucaena leucocephala); T2 = turi (Sesbania grandiflora). and second factor was kind of rhizobium isolates, I1 = without isolate; I2 = rhizobium that was isolated from lamtoro, I3 = rhizobium that was isolated from turi; I4 = combination isolate from lamtoro and turi. The crop growth was observed up to 10 weeks of age. The parameters were 1) crops heigh; 2) sum of leaf crops; 3) fresh weight production; 4) dry weight production; 5) amount and fresh weigh of effective root nodules. The study showed the growth and production of turi in saline media of EC 20.45 mmhos/cm was higher than lamtoro. Root nodule of turi was formed, but lamtoro was not. Turi was more tolerant than lamtoro at very saline media.

The objective of this research was to know growth and the production of watermelon plants through the treatment of pruning time on shoots and the amount of residual fruit after thinning. The research was carried out on Klaten Watermelon Clay, located in Genukan Village, Wedi Sub-district, Klaten District, and at the Laboratory Chemistry and Food Nutrition Faculty of Animal and Agricultural Sciences, Diponegoro University from February to May 2017. The research was arranged using completely randomized factorial design with the first factor being shoot pruning time (P1 = no trimming, P2 = 3rd week, P3 = 6th week, P4 = 3rd and 6th week) and the second factor was the rest of the fruit after thinning (Q1 = without thinning, Q2 = thinning leaves 1 piece, Q3 = thinning leaves 2 pieces). The results showed the treatment of pruning of shoots and the remaining fruit after spacing did not affect the growth plant height and number of leaves watermelon until 8th week. However pruning of shoots 3rd week and 6th week can affect fruit diameter, fresh fruit weight, and fruit sugar levels. Treatment of the remaining fruit after the spacing is pruned 2 pieces affect the diameter of fruit and fresh weight of fruit while the rest of the fruit after spacing is purned 1 pieces fruit affect the fruit sugar levels. Keywords: watermelon, pruning, thinning, production ABSTRAK  Penelitian bertujuan untuk mengetahui pertumbuhan dan hasil produksi tanaman buah semangka melalui perlakuan waktupemangkasan pada pucuk dan jumlah sisa buah setelah penjarangan. Penelitian ini dilaksanakan pada di lahan Sahabat Semangka Klaten, yang terletak di Desa Genukan, Kecamatan Wedi, Kabupaten Klaten, dan di Laboratorium Kimia dan Gizi Pangan Fakultas Peternakan dan Pertanian Universitas Diponegorodari bulan Juli - September2017. Penelitian disusun menggunakan rancangan acak lengkap factorial dengan faktor pertama adalah waktu pemangkasan pucuk (P1 = tanpa pemangkasan, P2 = minggu ke 3, P3 = minggu ke 6, P4 = minggu ke 3 dan 6) danfaktor kedua adalah sisa buah setelah penjarangan (Q1 = tanpa penjarangan, Q2 = penjarangan disisakan 1 buah, Q3 = penjarangan disisakan 2 buah). Hasil penelitian menunjukan perlakuan pemangkasan pucuk dan sisa buah setelah penjarangan tidak mempengaruhi pertumbuhan tinggi tanaman dan jumlah daun semangka sampai minggu ke 8. Namun pemangkasan pemangkasan pucuk minggu ke 3 dan 6 mempengaruhi diameter buah, bobot segar buah, dan kadar gula buah. Perlakuan sisa buah setelah penjarangan yang dijarangkan 2 buah mempengaruhi diameter buah dan bobot segar buah sedangkan sisa buah setelah penjarangan yang dijarangkan 1 buah mempengaruhi kadar gula buah.Kata Kunci: semangka, pemangkasan, penjarangan, produksi

The research aims was to investigate the interaction between dose of leaf compost and pruning on the growth and production of red okra. The research was assigned in basic design of completely randomized 4x2 factorial with three replications. The first factor was doses of leaf K (0, 50, 100, 150 kg N / ha). The second factor was pruning P (unpruned and pruned), each treatment was repeated three times. The parameters measured were stem diameter, number of leaves, number of fruits per plant, number of fruit per plot, and fruit weight per plot,. The data were analyzed statistically by of variance followed by Duncan's Multiple Range Test (DMRT). The results showed that there was no interaction effect at treatment doses of compost litter and pruning. Dosage of compost litter of 50 kg N / ha can increase the growth of girth, number of leaves, and the number of fruit per plot. Litter compost fertilizer dose of 100 kg N / ha can promote the growth and production of red okra. Pruning treatment can increase the production of red okra.

The objective of this research was to study the hardiness of several soybean varieties to different levels of water salinity and to find out the effect of salinity on soybean growth and production. This research was conducted in Greenhouse and Laboratory of Ecology and Plant Production at Faculty of Animal and Agricultural Sciences, Diponegoro University from February to May 2017. The research was arranged using completely randomized factorial design with the first factor was soybean varieties (Dering 1, Demas 2, and Devon 3) and the second factor was water salinity level (0 dS/m, 3 dS/m, 6 dS/m and 9 dS/m). The result showed that the treatment of 3 dS/m water salinity level did not affect at plant height and number of leaves until 4th week. However salinity of 6 and 9 dS/m decreased the height and number of leaves from all varieties. Salinity level of 3, 6 and 9 dS/m decreased the number of pod, weight of pod and 100 seeds weight from all verieties. Dering 1 yielded 100 seeds weight heavier than Demas 1 and Devon 1.Keywords : growth, production, salinity, soybean. ABSTRAKPenelitian ini bertujuan untuk menguji ketahanan beberapa varietas kedelai baru terhadap tingkat salinitas air siraman yang berbeda dan mengetahui pengaruh salinitas terhadap pertumbuhan dan produksi kedelai. Penelitian dilakukan di greenhouse dan Laboratorium Ekologi dan Produksi Tanaman Fakultas Peternakan dan Pertanian Universitas Diponegoro, Semarang pada bulan Februari -Mei 2017. Penelitian disusun menggunakan rancangan acak lengkap factorial dengan faktor pertama adalah tingkat salinitas air penyiraman (0 dS/m, 3 dS/m, 6 dS/m dan 9 dS/m) dan faktor kedua adalah varietas kedelai (Dering 1, Demas 1, dan Devon 1). Hasil penelitian menunjukkan tingkat salinitas 3 dS/m tidak mempengaruhi pertumbuhan tinggi tanaman dan jumlah daun kedelai sampai minggu ke 4. Namun salinitas 6 dan 9 dS/m menurunkan pertumbuhan tinggi tanaman dan jumlah daun oada semua jenis kedelai yang dicobakan. Penyiraman 3, 6 dan 9 dS/m menurunkan jumlah polong, berat polong dan bobot 100 biji pada semua kedelai yang dicobakan. Varietas Dering1 menghasilkan bobot 100 biji lebih berat serta signifikan dibanding varietas Demas 1 dan Devon 1.Kata kunci : kedelai, pertumbuhan, produksi, salinitas. PENDAHULUANKedelai (Glycine max L. Merr) merupakan salah satu sumber protein nabati yang populer dan menempati urutan ketiga komoditas pangan penting setelah padi dan jagung bagi masyarakat Indonesia. Program swasembada kedelai menjadi salah satu sasaran strategis Kementerian Pertanian tahun 2015-2019. Kedelai popular dimanfaatkan sebagai bahan baku pembuatan tempe dan tahu. Berdasarkan survei nasional tahun 2015 oleh Badan Pusat Statistik (BPS), konsumsi rata-rata tempe setiap orang di Indonesia sebesar 6,99 kg/tahun dan konsumsi tahu 7,51 kg/tahun, Respon beberapa varietas Kedelai terhadap tingkat salinitas air penyiraman (Yunita et al.) 43