Effect of potassium fertilizer on yield and yield components of glutinous rice under saline soil condition
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Abstract
Salinity is abiotic stress affecting a decrease of growth and yield of rice. Potassium is an essential element that induces salt tolerance in plant. Appropriate potassium fertilizer application in saline soils can possibly improve rice yield under saline condition. The objective of this study was to determine the effect of potassium fertilizer rate on yield, yield components and their correlation of glutinous rice (RD6) under saline soil condition. A pot experiment was conducted with two salinity levels and five rates of potassium fertilizer. Rice yield and its component significantly decreased in the soil with 6 dsm-1 salinity level. At this salinity level, the application of 0.15 g K/pot gave rice grain yield of 7.7 g/pot, whereas without K fertilizer the yield was 3.4 g/pot. Grain yield under saline soil condition showed significantly positive correlation with straw weight, filled grain per pot, 1,000-grains weight, biomass and harvest index. Potassium fertilizer applied at 0.15 g K/pot can increase rice grain yield under saline condition by improve these plant characteristics.
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