EFFECT OF BURNED RICE HUSK ON GROWTH AND NUTRIENT UPTAKE OF COWPEA GROWN IN AN ALUMINUM TOXIC-SOIL | EFFECT OF BURNED RICE HUSK ON GROWTH AND NUTRIENT UPTAKE OF COWPEA GROWN IN AN ALUMINUM TOXIC-SOIL

English. The pot experiment was carried out under glasshouse at Khon Kaen University to study the effect of burned rice husk on dry matter yields and nutrient uptake of cowpea grown in aluminum- toxic soil. The treatment consisted of four levels of burned rice husk (0,12.50, 25.00, and 37.50 ton/ ha.) and aluminum (0,60,120 and 180 mg A1/kg of soil). The design of experiment was a factorial design arranged in randomized complete block with three replications. The results showed that dry matter yields of shoot and root of cowpea were affected by the percentages of soil aluminum saturation, the decrease in the amount of shoot plus root dry matter yields between the control treatment and the first level of aluminum treatment was as large as 47%. The percentages of soil aluminum saturation at approximately 25-30% reduced 50% dry matter yields of both shoot and root respectively. The three levels of burned rice husk increased dry matter yields over the control up to 33%, 51% and 62 respectively. Burned rice husk increased the uptake of N, P, K, Ca and Mg significantly but the reverse was with an increase in the amount of aluminum added to the soil.  

Thai. The pot experiment was carried out under glasshouse at Khon Kaen University to study the effect of burned rice husk on dry matter yields and nutrient uptake of cowpea grown in aluminum- toxic soil. The treatment consisted of four levels of burned rice husk (0,12.50, 25.00, and 37.50 ton/ ha.) and aluminum (0,60,120 and 180 mg A1/kg of soil). The design of experiment was a factorial design arranged in randomized complete block with three replications. The results showed that dry matter yields of shoot and root of cowpea were affected by the percentages of soil aluminum saturation, the decrease in the amount of shoot plus root dry matter yields between the control treatment and the first level of aluminum treatment was as large as 47%. The percentages of soil aluminum saturation at approximately 25-30% reduced 50% dry matter yields of both shoot and root respectively. The three levels of burned rice husk increased dry matter yields over the control up to 33%, 51% and 62 respectively. Burned rice husk increased the uptake of N, P, K, Ca and Mg significantly but the reverse was with an increase in the amount of aluminum added to the soil.