Bambara groundnut is considered tolerant to drought and unfertile soil; therefore, has higher potential to be cultivated. The average yield of dry pod weight from agricultural fields in Indonesia is still low (< 4

Efforts to increase soybean productivity must be synergy with the improvement of soil fertility through fertilizer, especially organic fertilizer. Population density of a crop determines to a greater extent its performance in terms of soybean yield. Based on the two cultivation techniques mention above, that is expected to increase soybean productivity. The objective of this research was to obtain organic fertilizer and plant spacing that can support the development of early-medium maturity soybean (Lokal Jateng soybean lines/Sinabung-1036) to achieve 3 ton dry seed per hectare. The research was conducted at Alfisol soil Muneng Station Research, Probolinggo and at Entisol soil Genteng Station Research, Banyuwangi on dry season (DS) 2012. The experiment used split plot design with three replications. As the main plot was plant spacing, namely: 1) 40 cm x 10 cm, 2 plants/hole, 2) 40 cm x 15 cm, 2 plants/hole, 3) 40 cm x 20 cm, 1 plant/hole, and 4) 40 cm x 20 cm, 2 plants/hole. As the sub plot were four doses and types of organic fertilizer, namely: 1) without organic fertilizer, 2) 2.5 t manure/ha, 3) 5 t manure/ha, and 4) 2 t Santap NM-2/ha. The result showed that the potential yield of 3 t/ha for large, early-medium maturity soybean could not be achieved at Alfisol soil Probolinggo and at Entisol soil Banyuwangi by planting soybean of Lokal Jateng soybean lines/Sinabung-1036 with plant spacing 40 cm x 10-20 cm, 1-2 plants/hole and application of 2.5-5 t manure/ha or 2 t Santap NM-2/ha.

Application of organic fertilizer can maintain and improve physical, chemical, and biological soil fertility and plant productivity. However, the use of manure requires a long time and a relatively large amount to have a positive impact on the soil and plants. In this regard, a study was carried out to evaluate the effect of the application of organic fertilizer and NPK inorganic fertilizer on soybean in lowland Vertisol. The study was conducted in lowland Vertisols in Ngawi and Madiun. The experiment used a randomized block design with three replications, with combination treatments of cow and chicken manure, Santap NM1 and NM2 fertilizer, and Phonska. The soybean seed used in this research was Local Central Java/Sinabung-1036 soybean line. The results showed that in lowland Vertisol of Ngawi which is rich in P element, application of 5,000 kg of cow manure/ha, 3,000 kg of chicken manure/ha, 1,500-2,500 kg/ha Santap NM1 and NM2 fertilizers, and 300 kg of Phonska/ha is not required. The yield of Local Central Java/Sinabung-1036 soybean line reached 1.95 t/ha. The lowland Vertisol of Madiun which has poor P element requires the addition of 5,000 kg of cow manure/ha, 1,500-2,500 kg/ha of Santap NM2 fertilizer, and 150 kg of Phonska/ha to increase soybean yield by 21-27% (0.42-0.55 t/ha). The quality and productivity of soil and crop cultivation in sustainable agriculture can be maintained by alternative recommendations for the use of organic and inorganic fertilizer inputs.

<p>Kacang hijau dipandang sebagai komoditas alternatif untuk dikembangkan di tanah masam. Identifikasi untuk mendapatkan teknologi budidaya yang sesuai, perlu dilakukan guna meningkatkan produktivitas. Penelitian ini bertujuan untuk mendapatkan kombinasi varietas dan pupuk yang efektif, guna meningkatkan produktivitas kacang hijau di tanah masam. Penelitian dilaksanakan di rumah kasa Balai Penelitian Tanaman Aneka Kacang dan Umbi (Balitkabi), Malang, Jawa Timur mulai bulan November 2014-Januari 2015. Penelitian ini menggunakan Rancangan Split Plot dengan tiga ulangan. Petak utama adalah empat macam varietas kacang hijau, yaitu: Kenari (V1), Murai (V2), Kutilang (V3), dan Vima 1 (V4). Anak petak adalah lima macam pemupukan, yaitu: tanpa pemupukan (P0), Phonska 300 kg/ha (P1), pupuk kandang sapi 1.500 kg/ha (P2), pupuk kandang sapi 3.000 kg/ha (P3), dan pupuk kandang sapi 5.000 kg/ha (P4). Dengan demikian, terdapat 20 perlakuan dengan tiga ulangan. Hasil penelitian menunjukkan bahwa penggunaan varietas Kenari atau Vima 1 dan aplikasi 300 kg pupuk Phonska memberikan bobot biji kacang hijau tertinggi. Hasil tertinggi terdapat pada varietas Kenari dengan aplikasi 300 kg Phonska, yaitu sebesar 6,52 g.</p>

Its early maturity and drought resistance allows mungbean to be cultivated on upland with dry climate. Approriate cultivation technology need to be identified in order to increase productivity. The research objective was to formulate cultivation technology package by assessing interaction between plant population, optimum organic and anorganic fertilizers on mungbean. This experiment was conducted on upland Alfisol soil with type E climate in Probolinggo, East Java on dry season 2015, using split plot design, with three replications. As the main plot was plant spacing, namely: 1) 40 cm x 10 cm, 1 plant/hole, 2) 40 cm x 15 cm, 2 plants/ hole, and 3) 40 cm x 20 cm, 2 plants/hole. As the sub plot was combination of organic and anorganic fertilizers, namely: 1) without fertilizer, 2) 50 kg ZA + 50 kg SP36 + 100 kg KCl/ha, 3) 150 kg Phonska/ha, 4) 5 ton manure/ha, and 5) 75 kg Phonska + 2,5 ton manure/ha. Medium dose of NPK fertilizer (22,5 kg N + 22,5 kg P 2 O 5 + 22,5 kg K 2 O + 15 kg S) per ha and plant population of 250.000 until 333.333 plant per ha, was considered suitable to grow mungbean at upland with dry climates, based on the obtained yield. While low dose of NPK fertilizer (11,3 kg N + 11,3 kg P 2 O 5 + 11,3 kg K 2 O + 7,5 kg S) plus 2.500 kg manure/ha was capable of producing high biomass of mungbean up to 3,2 kg/ha.