Abstract
Seeds of oryza sativa were cultivated in the seedlings and the effects of urea on the changes of pH in the soil and growth of paddy were observed. Urea (80 kg/ha) was applied to one of the seedlings after 20 days of germination and the soil pH and length of paddy were determined from 25 days of urea application. Soil pH was gradually decreased with increasing paddy grown in the control seedling. However, no changes of pH were found in the urea treated seedling up to 20 days of germination and were similar to the control paddy. The pH of soil compared to the control falls gradually with increasing paddy growth. We also examined the effect of urea on paddy length and compared to the control paddy. Paddy length was gradually increasing in both the control and urea treated seedlings from the germination. However, higher length was found in the urea treated seedling. Up to 20 days of germination of paddy, no differences of paddy length in the two seedlings were observed. These findings suggest that urea is the potent compound inducing growth of paddy and pH measurements indicate the period where optimum uptake of urea is happened.
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