ABSTRACT<br /><br />Twelve soybean shade tolerant promising lines and two check varieties, Pangrango and Argomulyo, were evaluated in eight locations covered varying degree of shades. The objective of this study was to assess the effect of genotype x environment interaction on seed yield and yield components, as well as on adaptation and yield stability of the lines  under those environments. The trial, in each location, was arranged in randomized block design repeated four times. The traits evaluated were days of flowering, maturity days, plant height, pod number, 100 seed weight, and seed yield. Light intensity was measured during generative phase, started at plants’ 30 days old,  two week interval. The results showed that genotype x environment interaction significantly affected those evaluated traits. Stability analysis revealed that four lines, i.e., IBK5-173-5-372, IBM22-861-2-22, IBM22-862-4-1, and IBM22-867-4-7 poorly adapted to the environments as indicated by coefficient regressions approximating 1.0 and low yield average. Eight lines, i.e., IBK5-143-3-7, IBK5-147-2-11, IBK5-172-4-36, IBK5-173-5-371, IIj9-299-1-4, IBM22-873-1-13, IBIj11-431-2-20, and AI26-1114-8-28, and the two check varieties, Pangrango and Argomulyo, were unstable. Of the 13 unstable genotypes, two lines, AI26-1114-8-28  and IBM22-873-1-13, gave higher average yield under shade condition (35%-70% shading level), 1.68 t/ha and 1.36 ton ha-1, respectively, than the two check varieties.<br /><br />Keywords: adaptation, Glycine max<br /><br />

The main constraints of the tidal swamp lands in Indonesia for soybean growth are low soil pH, high Al saturation, and low nutrient availability of N, P, K, Ca, and Mg. The objectives of this research were to determine tolerance of several soybean varieties to Al saturation level, and to obtain a technological package for soybean cultivation which was suitable for farmers to adopt on tidal swamp lands. The research consisted of two stages of study. The first stage formulated of technology package, and the second stage evaluated feasibility of the technology package which was formulation from the first stage. The first stage  studied  the effect of  dolomite application (20% - 30% of soil Al saturation) on four soybean varieties (Anjasmoro, Panderman, Dega 1, and Demas). The second stage studied the effect of three technological packages: existing technology; water- saturated soybean cultivation (WSC); and alternative technology which was formulated from the results of the first study. In the 30% of soil Al saturation condition, the alternative technology package (application of 50 kg urea + 75 kg SP36 + 50 kg KCl + 1500 kg organic fertilizers/ha + rhizobium biofertilizer “Agriosy” 0.25 kg/50 g seeds/ha)  gave soybean yield of 1.78 - 2.72 t/ha for all of soybean varieties tested. The alternative technology package with Anjasmoro variety provided higher seed yields (2.62 t/ha) compared to the existing technology (2.07 t/ha) and WSC technology package (2.44 t/ha). The alternative technology package gave a profit of 11,595,000 IRD/ha with B/C values of 1.71 which was higer than the existing and WSC technology packages. The alternative technology package was more profitable than the existing technology (current farmer practice) and water-saturated soybean cultivation technology packages.

<p class="teks">Tumpangsari (TS) kedelai dengan padi gogo atau jagung merupakan salah satu strategi meningkatkan luas panen dan produksi kedelai. Penelitian ini bertujuan untuk menentukan model tanam TS padi gogo (pg)+ kedelai (kd) dan TS jagung (jg)+ kedelai (kd) yang optimal. Penelitian dilaksanakan di IP2TP Kendalpayak mulai Oktober 2018 hingga Januari 2019. Perlakuan terdiri atas kombinasi empat model tanam  dengan dua varietas kedelai (Dega 1 dan Dena 1) termasuk pemupukannya pada TS pg+kd dan TS jg+kd. Varietas padi gogo dan jagung berturut-turut Inpago 10 dan Bima 19. Model tanam (M) pada TS pg+kd terdiri atas: M1: 75% pg + 91% kd tanpa pupuk, M2: 37% pg + 91% kd tanpa pupuk, M3: 37% pg + 152% kd dipupuk 23-36-30 kg/ha N, P, K + 1 t/ha pupuk kandang (pukan), dan M4: 18% pg+72% kd dipupuk 23-36-30 kg/ha N, P, K + 1 t/ha pukan. Padi gogo ditanam bersamaan dengan kedelai, dengan dosis pemupukan 144,5-52,5-52,5 kg/ha N, P, K + 1 t/ha pukan. Model tanam pada TS jg+kd terdiri atas: M1: 150% jg ditanam 3 minggu setelah kedelai + 114% kd dipupuk 38-15-15 kg/ha N, P, K, M2: 150% jg + 114% kd dipupuk 107-15-15 kg/ha N, P, K + 2,5 t/ha pukan, M3: 150% jg + 227% kd dipupuk seperti pada M2, dan M4: 52% jg + 70% kd dipupuk 23-36-36 kg/ha N, P, K + 1 t/ha pukan. Dosis pemupukan jagung 167,5-52,5-52,5 kg/ha N, P, K + 1 t/ha pukan. Hasil penelitian menunjukkan bahwa model tanam optimal pada TS padi gogo + kedelai adalah Model 1 dan Model 2 menggunakan kedelai varietas Dega 1, dengan keuntungan masing-masing Rp9.086.500 dan Rp8.896.500/ha. Model yang optimal pada TS jagung + kedelai adalah Model 1 menggunakan kedelai varietas Dega 1 dengan keuntungan Rp20.121.400/ha. Masing-masing model tanam tersebut mempunyai keunggulan dalam hal produktivitas dan perolehan keuntungan dibandingkan model lainnya yang diuji. Oleh karena itu, pada TS padi gogo + kedelai dengan Model 1 atau Model 2 atau pada TS jagung + kedelai dengan Model 1 lebih dianjurkan menggunakan kedelai varietas Dega 1 dibandingkan Dena 1.<br /><br /></p>

<p>Intercropping is one way of increasing land productivity. The research was aimed to determine the suitability of soybean promising lines for maize + soybean intercropping based on land productivity assessed by land equivalent ratio (LER). The research was conducted at Kendalpayak Station Research, Malang, in February to May 2016, using factorial randomized block design, repeated three times. The first factor was cropping system (monoculture and intercropping), the second factor was 55 soybean genotypes. Spacing for maize in the intercropping system was 2.2 m x 0.5 m x 0.2 m, and for soybean was 0.35 m x 0.10 m. In monoculture, spacing for maize was 0.75 m x 0.25 m and for soybean was 0.35 m x 0.10 m. The results showed there was five genotypes suitable for intercropping of maize + soybean based LER value, ie G//IT7-3, M0706//MI196-3, M0706//MI197-4, M0706//MI199-1, and M0706//MI199-2, with LER value of more than 1. Intercropping of maize with these soybean lines, gives a higher land productivity than monoculture.<br /><br />Keywords: Glycine max (L.) Merrill genotype, monoculture, land equivalent ratio, Zea mays <br /><br /></p>

ABSTRACT. Intensity and quality of sunlight received by plants AI26-1114-8-28 and IIj9-299-1-4 were considered as shade-tolerant up to 75% shade based on the stress index tolerance value (ITC).