Itthiphon khong pui nitrogen phosphorus lae potassium thi mi to khunnaphap khong protein lae khwam samphan rawang krot amino lae protein nai malet thanyaphut II. Khao phot lae khao fang.
1988
Sumittra Poovarodom | Eppendorfer W.H.
The effects of N, P and K applications on protein production and protein quality of maize and sorghum grain were evaluated through a series of pot experiments. N amendment generally raised protein content (%N X 6.25) in both maize and sorghum. On the other hand, deficiency of both P and K resulted in higher protein content due to reduction in grain yield. Concentration of N in grain obtained from the experiments ranging from 1.06 to 2.63% for maize and 1.01 to 1.80% for sorghum. In both cereals, concentrations in grain protein (g/16gN) of lysine, methionine, cystine and threonine were decreased, whereas the concentrations of leucine, isoleucine and phenylalanine were increased with increasing N concentration. In Contrast, concentrations of all amino acids as mg/100 g DM increase with N content. Linear regression with significant correlation coefficients were found between concentrations of most (g/16g N) and all (mg/100g DM) and N content in grain. The following relationships were established for lysine: in maize g/16g N = 4.35 - 0.85 X %N (r =-0.93) and in sorghum g/16gN =4.57-1.20 X %N (r = -0.94). The results also indicated that lysine was the first limiting amino acid in both maize and sorghum.
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