Improvement of growth and yield of several varieties of soybean following paddy rice using Rhizobium biofertilizer with reduced NPK doses Wayan Wangiyana, Dian Febriana Arianti, I Ketut Ngawit
University of Mataram
Abstract
In paddy fields, soybean is generally planted following harvest of the rainy season paddy rice or after the second paddy, and the average yield achieved by farmers is still relatively low. This study aimed to examine the effect of applying Rhizobium biofertilizer with a reduced dose of NPK fertilizer on growth and yield of soybean grown following flooded rice crop. The experiment was carried out on farmers^ paddy fields in Masbagik, East Lombok (Indonesia) from August to November 2020, which was arranged according to a Randomized Block Design, consisting of two treatment factors, namely soybean varieties (V1= Anjasmoro, V2= Grobogan, V3= Biosoy-2) and biofertilizers (P0= without biofertilizer (recommended dose of NPK), P1= 50% NPK dose + Rhizobium). The results showed that the application of Rhizobium biofertilizer did not significantly increase growth and yield of soybean except for the weight of 100 grains, but there was an interaction effect of the treatment factors on trifoliate number 35 DAP, pod number 56 DAP, unfilled pod number, grain yield, weight of 100 grains and harvest index, showing that grain yields of Grobogan (2.03 tons/ha) and Biosoy-2 (2.31 tons/ha) were significantly higher with application of the biofertilizer while that of Anjasmoro variety (2.83 tons/ha) was higher under recommended doses of NPK fertilization. However, in general it can be concluded that the dose of NPK fertilizer can be reduced by 50% from the recommended dose if it is accompanied by application of Rhizobium biofertilizer.
