Growth Analysis of Soybean Varieties at Dry Land With Application Of Nitrogen Sources
Nisa, Tengku Chairun
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Soybean is annual major crops in the world and important legumes in food security. Increased soybean production can achieve through increased in the intensity of soybean cultivation and expansion of soybean cultivation to marginal lands such as dry land. Nitrogen is a limited nutrient at dry land. The objective of this research was to determine the growth analysis of three soybean varieties on dry land with application of Nitrogen sources. Research using randomized block design with 2 factors and 3 replications. The first factor is soybean varieties (Anjasmoro, Wilis and Sinabung). The second factor is the sources of N consists of without application of N, Urea 50 kg/ha, Bradyrhizobium sp., manure 10 tons/ha and combinations of Bradyrhizobium sp. + manure 5 tons/ha. The research result shown that Anjasmoro variety significantly increased the relative growth rate and net assimilation rate 5-6 WAP compared with Sinabung and Wilis. Application of Bradyrhizobium sp. significantly increased the plant growth rate and relative growth rate 5-6 WAP compared with other N treatments. Combination of Bradyrhizobium sp. and manure 5 tons/ha on Anjasmoro variety tent to increase the net assimilation rate 5-6 WAP.