Production And Physiological Characters of Soybean Varieties Under Drought Stress With Application Of Nitrogen Sources
Nisa, Tengku Chairun
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Soybean is a legume sensitive to drought conditions resulting in decreased yield and seed quality. Drought stress on plants also inhibits nitrogen uptake. The objective of the research was to determine production and physiological characters of soybean varleties under drought stress through nutrient N management. This research used a randomized block design with 3 factors and 3 replications. The first factor was soybean varieties (Anjasmoro, Wilis and Sinabung). The second factor was drought stress conditions consisted of 50%, 60%, 70% and 80% of field capacity (FC). The third factor was the application of N consisted of (1). Without application of N fertillzer (control); (2). N fertilizer dose of recommendation (50 kg Urea/ha); (3). Inoculation of Bradyrhizobium sp. ; (4). Organic N sources (straw compost 10 tons/ha) ; (5). Organic N sources (farmyard manure 10 tons/ha). The results suggest that Anjasmoro variety improved dry weight of seed per plant compared with Willis and Sinabung, increased drought stress ( 80-50 % of FC) resulted in a decrease in dry weight of seed per plant. Sources of N in the form of urea or Bradyrhizobium sp. increased the dry weight of seeds per plant compared with treatment N sources straw and manure compost. The interaction between Bradyrhizobium sp. or Urea and Anjasmoro variety improved dry welght of seeds per plant.