Itthiphon khong phosphate attra tang tang to kandutchai that ahan sangkasi nai rup tang tang khong khao thi pluk nai dinruan pon sai chut Roi-et phosphate attra tang tang ruam kap that sangkasi nai rup chelate lae sulfate attra tam to suan pra kop thang chemi lae phon pha lit khong khao.
1986
Chayong Nammuang | Wiwat Ingkapradit | Chaturong Pipatpiriyanon
Experimental design was arranged in factorial 3x5 combinations with three sources of Zn (zinc chelate, zinc sulfate and no zinc) at a rate of 10 mg-Zn kg. (exp. -1) soil and 5 rates of phosphate (0, 25, 50, 100 and 200 mg-P2O5 kg. (exp. -1) soil). Nitrogen and potassium were basally applied at rates of 100 mg-N and 25 mg-K2O kg (exp. -1) soil, respectively, for all treatments. The growth and yield of rice, P, Zn, and other plant nutrients in both plant and soil were determined. Thus, the objective was to investigate the effects of phosphate at various rates on the availability of applied Zn of different sources to the rice plant. The applied P and Zn affected the plant growth and nutrient uptake of rice. Phosphorus at a high rate of 200 mg-P2O5 kg. (exp. -1) soil increased grain and straw yield of rice and tended to decrease a percentage of unfilled grain, especially when it was used along with Zn-chelate or ZnSO4. The applied P and Zn also affected the nutrient concentrations in the plants so that the concentrations reflected actual differences in uptake of P, Zn and other plant nutrients of plants. Phosphorus and ZnSO4 appeared to be mutually antagonistic. Whenever either element concentration in the soil was high, its effect would suppress rice uptake of the other element. This might be affected from the P-Zn antagonism in the rice plant (Burleson et al. 1961; Boan and Legget, 1964). However, there appeared to be no antagonistic effects between P and Zn-chelate. ZnSO4 decreased P uptake of rice, whereas Zn-chelate increased the uptake of P. The applied Zn-chelate reduced the fixation of P in the soil better than the ZnSO4 did.
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