Influence of acidity, aluminum, iron and manganese on concentration of some toxic substances in soil and on the growth, yield and some chemical composition of RD23 rice in acid sulfate soil
1985
Laddawan Pienpermpat
The results showed that rice seedlings were not able to tolerate toxic substances released in the soil adjusted to pH 2 and died a few days later. At the other pH adjustments, no significant difference in growth and yield components were obtained. It tolerated the toxic effect of 3.80 x 10 to the negative four power mole/liter of H+, 18 ppm Al+++ and 440 ppm Fe++. Addition of 10 me Al/100g soil decreased grain yield significantly because of the decrease in the growth and number of panicles/hill but resulted in increased sterility. Amount of Fe added, at the minimum rate (0.5 percent Fe) killed the normal seedlings because of 1506 ppm Fe++ present at the transplanting stage. Addition of Mn (II) to soil increased grain yield due to the improvement of number of panicle/hill and number of grain/panicle, but at the rate higher than 1500 ppm grain yield was significantly decreased. Acidity increase in the soil (from pH 3 to 7) significantly increased Fe in the top of rice at maturity but decreased significantly the rice top Mn content. No effect on plant Al content was observed. The increasing rates of Al added did not affect rice top Al content but significantly increased the plant Fe at PI and maturing stages especially from 10 to 15 me Al/100g added but that of the plant Mn was reversed. The 0.5 percent Fe addition considerably increased Fe and Al in the top of rice but appreciably decreased the plant Mn at flowering and maturity. Mn in the top of rice significantly increased at the increasing rates of Mn (II) addition but no significant effect on the plant Al and Fe content
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