GROWTH AND PRODUCTIVITY OF SOYBEAN (GLYCINE MAX (L.) MERR.) GENOTYPES UNDER SHADING

The research was aimed to determine the growth of soybean genotypes under shading. This Research was conducted in Malang, East Java, Indonesia. Treatments entailed of two factors, namely level of shading and soybean genotypes, arranged in factorial randomized complete block design with three replications. Level shading entailed of without shading and 50% shading, while soybean genotypes included of Argopuro, Dena 1, Dena 2, Dena 3, Grobogan, Panderman, and Karat 13. The results indicated that the soybean genotype responses to shading were different. Shading reduced leaf area index (LAI), net assimilation rate (NAR), and plant growth rate (PGR), however it increased the specific leaf area (SLA) and leaf area ratio (LAR Dena 1 genotype showed the lowest PGR stress intensity at 6%, followed by Panderman (16%) which are below the average of genotypes stress intensity at 56 DAP (24%). The PGR had significantly positive correlation with seed yield. The average decrease in seed yields of 7 soybean genotypes were 32%, and Dena 1 showed the most tolerant to shading. This proved wih the fact that of Dena 1 which is currently widely planted by the farmers in Indonesia on an intercropping pattern, or under shading of young plantation crops.