Kajian Naungan, Taraf Pupuk Urea Dan Varietas Kedelai (Glycine Max L.) Terhadap Pertumbuhan Dan Produksi Tanaman Kedelai Sebagai Tanaman Sela Di Areal Pertanaman Kelapa Sawit Menghasilkan

Abstract

The aims of this research was to analyze morpo_physiology changing of soybean under oilpam area; determine effect of shading and N fertilizer dosage on the growth and yield of soybean under oilpam area; and determine suitable soybean varieties that enable grow and produce under oilpalm.The experiment located in Ujung Labuan Village, Deli Serdang District. The experiment was arranged in Split-split Plot Design 3 x 4 x 3 with 3 replication, with three factors observed: 1) shade level, consist of: under 4 years old oilpam, under 6 years old oilpam, open area, 2) N dosage,: 200 kg urea/ha, 150 kg/ha, 100 kg urea/ha, 0 kg urea/ha, 3) soybean variety: Anjasmoro, Burangrang, and Grobogan. Plant height, leaf area, plant dry weight, and soybean production were determined. Result showed there were some significant effects of interaction factors between oilpalm canopy shading, N dosage and soybean variety on growth and yield of soybean. The highest growth and production of soybean found at open area. Between 4 years old oilpam and 6-7 years old oilpam, soybean growth and production are unsignificant different, and lower than those on opening area. N dosage make some significat effects on growth and yield of soybean, which is usually nonsignificant between 150 kg Urea/ha or 200 kg Urea/ha. Meanwhile soybean variety make some significat effects. At open area, burangrang make the highest growth and production by application of 200 kg urea/ha, but under oilpalm the highest production found at Burangrang under 4 years old oilpalm and application of 200 kg urea/ha, followed by several treatments which are unsignifican different