Itthiphon khong pui nitrogen phosphorus lae potassium thi mi to khunnaphap khong protein lae khwam samphan rawang krot amino lae protein nai malet thanyaphut I. Khao.
1988
Sumittra Poovarodom | Eppendorfer W.H.
Rice, cv RD7 was grown in series of pot experiments with varying amounts of N, P and K. N contents of rice grain obtained from the experiments varied from 0.81 to 2.26 % (as % of DM). N applications, P and K deficiencies increased N content of grain. Total amino acid composition of rough rice was mainly dependent on N content of grain. Increasing N concentrations were associated with decreases in crude protein of amino acids (g/16 gN) including lysine, threonine, methionine, cystine and tryptophan, whereas the concentrations of glutamic acid, leucine, tyrosine and phenylalanine increased. When expressed as mg amino acid per 100g dry matter, concentration of all amino acids increased with increasing N content. Linear regressions with significant correlation coefficients were found between concentrations of most (g/16 gN) and all (mg N/100 gDM) amino acids and N content of grain. The following equations were established for lysine: g lysine/16 gN = 4.83-0.68 X %N (r =-0.89) and mg lysine/100 g DM = 81 + 178 X %N (r = 0.99). The results indicate the possibility of calculating the amino acid composition of grain of a particular variety on the basis of N concentration alone. In contrast to N application, the amino acid composition was only indirectly affected by P and K applications through their effects on N concentration. Lysine was limiting in all samples whereas threonine became limiting at N content higher than 1.1%. All other amino acids were not limiting in rice.
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