Black soybean (Glycine soja (L.) Merril) is one of the potential agricultural commodities in Indonesia. The multilocation trial is the primary requirement for variety release before farmers can widely use the new varieties. Various stability measurements on grain yields will provide more accurate information in selecting superior lines. The aims of the study were to: (i) identify the effect of genotype by environment interactions (G×E) on black soybean grain yields; (ii) select the black soybean lines with stable and high grain yields in different agroecosystems; and (iii) determine the best representative environment for testing black soybean lines. The field trials used an augmented design that was applied in three blocks for each location. The research was conducted in West Java, Indonesia, specifically in Sumedang, Indramayu, and Majalengka. The three locations are traditionally soybean production areas in West Java. The results showed that G×E significantly affected grain yields, with a contribution of 38.35%. Based on the results of stability testing using parametric, non-parametric, and genotype plus genotype by environments (GGE) biplot measurements, the G13, G22, G25, and G26 lines were considered the most stable and produced the highest yields in the three agroecosystems. In addition, Sumedang is the most representative location for testing black soybeans in Indonesia. Therefore, the four lines can be proposed as new superior lines for black soybeans with high yields and stability in three environments. Information about the relationship between the yield stability parameters can be used for the most accessible parameter selection.

The study’s objective was to determine the effect of dose Fertilizer Coop Chicken and Plant Growth Promoting Rhizobacteria on growth and yield crops of onion (Allium ascalonicum L.). The research was conducted in the agricultural land of Sadasari Village, Argapura District, Majalengka Regency, West Java. With an altitude of 639 masl, starting from April 2020 to June 2020. The research method used a randomized block design (RBD) Factorial pattern was repeated 3 times. The treatment tested is Factor 1 is chicken manure (K), consisting of three levels: k 1 = 10 tons / ha, k 2 = 15 tons / ha and k 3 = 20 tonnes / ha. Factor 2 is PGPR (P), consisting of three levels: p 1 = 5 ml / litre water, p 2 = 10 ml / litre water, and p 3 = 1 5 ml / litre water . The difference in the average treatment was tested using Duncan’s Multiple Range Test at the 5% level. The results showed that there was an interaction between the dose of 20 ton / ha of chicken manure and 10 ml / l of PGPR of water on the average number of leaves aged 28 and 35 hst. The independent effect of chicken manure had a significant effect on the average plant height at 14 days and 35 days of planting, tuber diameter, average tuber wet weight per hill, and the average tuber dry weight per hill. The independent effect of PGPR has a significant effect on all observed parameters.

Kedelai merupakan komoditas pertanian yang sangat penting di Indonesia. Namun, produksi kedelai nasional belum dapat memenuhi kebutuhan kedelai nasional. Upaya yang dapat dilakukan adalah dengan menerapkan pola tanam tumpangsari kedelai dengan jagung. Penelitian ini bertujuan untuk mencari genotip kedelai yang mampu beradaptasi pada pertanaman tumpangsari dengan jagung pola 3:1 serta menghitung produktivitas penggunaan lahan setiap genotip pada pertanaman tumpangsari dengan jagung pola 3:1. Penelitian ini menggunakan metode eksperimen Rancangan Acak Kelompok (RAK). 16 genotip kedelai digunakan sebagai perlakuan, dan diulang sebanyak dua kali. Untuk melihat respons genotip pada pertanaman tumpangsari dilakukan dengan uji Least Significant Increase (LSI) pada taraf signifikansi 5%. Pendugaan produktivitas lahan pada setiap genotip dihitung berdasarkan nilai Nisbah Kesetaraan Lahan. Hasil penelitian ini menunjukkan genotip kedelai yang memperlihatkan respons paling baik pada pertanaman tumpangsari kedelai jagung dibandingkan kultivar cek untuk tinggi tanaman yaitu genotip BTN 5 dan JT 3, karakter jumlah cabang produktif yaitu genotip BTN 5, karakter luas daun dan indeks luas daun yaitu genotip JT 3, karakter sudut daun yaitu genotip CK 6, karakter bobot per plot yaitu genotip KBI 2, dan Nisbah Kesetaraan Lahan yaitu genotip CK 6 dan KBI 2.Genotip   BTN 1, BTN 2, BTN 5, CK 15, CK 6, JT 3, KA 6, KA 7, KBI 2, KH 8, Cikuray dan Malikka memiliki nilai NKL lebih besar dari 1,0. Soybean is one of important agricultural commodity in Indonesia. However, the national soybean production is not sufficient to meet the needs of national soybean. Effort to do is by applying an intercropping soybean with corn. The objectives of the research was to find soybean genotypes that can adapt to intercropped plantation with corn in pattern of 3 : 1 as well as the productivity of the land use of each genotype in intercropping with maize in 3 : 1 pattern. The research used an experimental method randomized block design (RBD), 16 soybean genotypes as treatments, and repeated twice. To see the response of genotype in intercropping planting was done by using Least Significant Increase (LSI) at the level of significant 5%. Estimation of land productivity on each genotype was calculated with Land Equation Ratio value. The results showed that the best response of soybean genotype compared checks cultivar for plant height were genotype BTN 5 and JT 3, character number of productive branches was genotype BTN 5, the character of leaf area and leaf area index was genotype JT 3 , leaf angle character was genotype CK 6, characters of weights per plot was KBI 2 genotype and Land Equation Ratio value were  CK 6 and KBI 2. Genotypes of BTN 1, BTN 2, BTN 5, CK 15, CK 6, JT 3, KA 6, KA 7, KBI 2, KH 8, Cikuray and Malikka had Land Equivalent Ratio values greater than 1.0.

Selecting high-yielding and stable genotypes is the main goal of black soybean breeding. Testing new lines in multiple environments is one of the development processes in black soybean breeding. The aims of the research were (i) to identify the effects of genotype, environment, and their interactions (GEIs) on the grain yield of soybean lines in Java Island; (ii) to select stable and high-yielding soybean lines; (iii) to determine the discriminative environments; and (iv) to determine the concept of stability measurements on black soybean grain yields. Field trials of 10 new F8 promising lines and three check varieties were conducted under eight different environments during four years (2016–2019). The measurement results showed that the grain yield was influenced by genotype (8.35%), environment (59.49%), and GEIs (32.16%). Grain yield stability measurements showed that the four newly identified lines had high yields and were stable in eight environments; they were A-5A-PSJ (S2), DB-96-CTY (S5), UP 161 (S6), and UP 162 (S7). The Ngawi (2017), followed by Bogor (2019) and Banyuwangi (2016), has the strongest interactive capabilities and is suitable for use as a trial environment. Grain yield (Y) was identified as having a positive and significant correlation ( p < 0.05 ) with S(3), S(6), NP(2), NP(3), NP(4), KR, and YSI stability measurements, which indicated that they were included in the concept of dynamic stability measurement. The selected genotypes can be proposed for the release of new high-yielding black soybean varieties in Indonesia.