Utilization of waste water from paper mulberry paper industry for rice production on acid sulfate soils
1999
Nirachara Pinestsatien
Results from experiment conducting in the laboratory showed that the waste water from paper mulberry paper industry was strongly alkaline pH, high Na+ concentration and low plant nutrients. Rangsit and Rangsit very acid soils were highly aicd (pH4.5), exchange acidity of Rangsit soil was less than that of Rangsit very acid, organic matter and total N of both soils were rather high and available phosphorus of Rangsit and Rangsit very acid soils were low. When the waste water and both acid sulfate soils were incubated under submerged condition at room temperature for 4 days, The waste water could apparently increase the soil pH. Application of the waste water at the rate of 150 and 300 cc/ 6 Kg soil in pot experiment resulted in the increase in grain yield of rice plant in Rangsit soil in all incubation period tested. Application of the waste water at 300 cc/ 6 Kg soil showed significant effect in increasing total N uptake of the rice plant but adding at 600 cc/6 Kg soil decreased grain yield of rice and total N uptake in every incubation period. The results from Rangsit very acid soils showed that application of the waste water at 75 and 150 cc/6 Kg soil increased grain yield of rice plant total N uptake and total P uptake with the markedly result being observed in 2 and 3 weeks incubation period. Adding of the waste water at 300 and 600 cc/6 Kg soil decreased grain yield of rice, total N, total P and total K uptake and the decrease was found in every incubation period. The waste water application at 75, 150, 300 and 600 cc/6 Kg soil in Rangsit and Rangsit very acid did not increase the values of soil pH, EC, SAR nor accumulate salt and sodium to the toxic level to plant.
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