The use of soybean and rice straw harvest waste for increasing P uptake and organic maize production in inceptisols

This study aimed to evaluate the potential of harvest waste (soybean and rice straw) at various doses on the efficiency of P uptake and maize yields. The study used a factorial randomized block design, the first factor being the type of harvest waste (C) two levels; C1= Rice Straw, C2= Soybean. The second factor is the dose of four levels of compost; D1 = dose of 5 tons ha-1, D2 = dose of 10 tons ha-1, D3 = dose of 15 tons ha-1, and D4 = dose of 20 tons ha-1, plus control treatment as a comparison. The results showed that there was a significant effect of the type of harvested waste compost and the dose on the parameters of plant height, leaf area, dry weight of 1000 seeds, total dry weight of plants, root uptake, crown, and total P and efficiency of P use. Treatment of soybean compost 10 tons ha-1 (C2D2) is the best treatment that can increase plant height (11.25%), stem diameter (41.38%), number of leaves and leaf area of 37.36% and 39.60%, respectively. In yield and P uptake parameters, C2D2 increased dry weight ton ha-1 (39.08%), root P uptake (258.86%), shoot P uptake (142.57%), total P uptake (158.29% ), and the efficiency P os use (12.45%). The optimum dose of straw compost was 16.76 tons ha-1 with maize yields of 5.38 tons ha-1, while the optimum dose of soybean compost was 12.85 tons ha-1 with maize yields of 5.32 tons ha-1.