Effect of lignite fly ash (LFA) on rice
1993
Raghupathy, B. (Annamalai Univ., Tamil Nadu (India). Soil Science and Agricultural Chemistry Dept.)
Lignite fly ash (LFA) combined with NPK resulted in the highest DMP [dry matter production] (22.7 g/pot), which was about 42% more than that of NPK alone. P content was consistently higher when LFA was added. LFA with N, P, K, and their combinations did not influence Si02 content in rice plants. Another pot culture trial in Dec 1987-Apr 1988 incorporated 0, 2.5, 5.0, and 7.5 g LFA/pot (0, 0.5, 1.0, and 1.5 t/ha) with 13 ppm P and no P. The experiment was conducted using a completely randomized design with three replications. N at 40 ppm and K at 11 ppm were applied to all pots. Regardless of P treatment, LFA at 5 g/pot gave the highest grain yield, followed by LFA at 2.5 g/pot. Applying P with LFA at 2.5 g/pot increased grain yield, but at 7.5 g LFA/pot, yields were reduced by 6.8% compared with no LFA. Straw yield was markedly increased with 5 g LFA/pot with or without P. LFA at 7.5 g/pot adversely affected straw yield. Silicicolous plants, such as rice, can benefit from up to 1 t LFA/ha, particularly in lateritic acid soils
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