The effect of organic fertilizer based on Azollamicrophylla biomass and plant spacing to n and p uptake, soil compaction and the yield of Pandanwangi rice

Abstract

The objective of the research was to study the effect of using azolla as organic fertilizer and plant spacing toward (i) N and P uptake, (ii) soil compaction and (iii) the yield of Pandanwangi rice. The research was conducted using Completely Block Randomized Design (CRBD) with 6 replicates of 2 factors combination. The first factor was doze of Azolla organic fertilizer consisted two levels were 2.5% and 5% of soil weight. The second factor was plant spacing consisted of three levels were 25cm × 25cm, 30cm ×30cm and 40cm × 40cm. Data was analysed by F test and if there were any significant effects then it was continued by using Duncan'n Multiple Range Test (α=5%). The result of this research showed that application of azolla organic fertilizer as much 5% of soil weight was able to increase N uptake and weight of grain per hill. The application of azolla organic fertilizer to all doze treatments was also able to reduce the soil compaction. The largest of plant spacing treatments was able to increase (i) N and P uptake, and (ii) weight of grain per hill.