Indonesian

Abstract

Amir B, Indradewa D, Putra ETS. 2015. Relationship of nodule and nitrate reductase activity with N uptake in some cultivars of soybean (Glycine max). Pros Sem Nas Masy Biodiv Indon 1: 1132-1135. This study aimed to learn and know about the relationship between nodule, nitrate reductase activity and N uptake in several soybeans (Glycine max L) cultivars. The experiment was conducted in April-July 2014. The design used in this study was complete randomized block design (RAKL) where each of the factors was repeated three times. There were five studied factors of soybean cultivars, namely: Argomulyo, Baluran, Ijen, Mahameru and Wilis. Different sorts of investigations were made on several tested cultivars such as nitrate reductase activity, N concentration in plants tissues, and plant dry weight. Data analysis was performed using analysis of variance (ANOVA) at 5% level of significance, Duncan's multiple range test (DMRT), correlation analysis, multiple linear regression, cluster analysis and traffic analysis (path analysis). Based on the observations on some agronomic and physiological factors it can be reported that Wilis cultivar absorbs the highest N compared to others tested cultivars and uptake of high N is not affected by root nodule, however the occurrence of translocation process of N from the nodule to the entire plant increases the N content in plant tissues and the amount of ANR that enhances the increase of N absorption. Mahameru cultivar showed the highest dry weight of nodule but not accompanied by elevated levels of N network, ANR and uptake of N.