Biological Response of Different Genotypes of Sorghum under Deficiency of Nitrogen, Phosphorus and Potassium
A pot experiment was carried out to study the effects of biological characters,nutrient uptake and grain yield of four different genotypes (Jiya2,T × 7000,F44B and 7501B) of Sorghum bicolor (L.) Moench with deficiency of N,P and K Under sunlight greenhouse conditions.The results showed that under the deficiency of N,P and K,the plant height,photosynthesis characters,aboveground biomass,nutrient uptake and grain yield of different genotypes of sorghum were shown to some extent a decline trend.Compared with the treatment of NPK(CK),the plant height and aboveground biomass of the different genotypes sorghum significantly were reduced by P deficiency (P ＜ 0.05).The decrease of the percentage of the height of genotype F44B in PK,NK and PK treatments at jointing stage were significantly lower than other three genotypes;the decrease of the percentage of aboveground biomass of genotype F44B in PK treatment and genotype T × 7000 in NP treatment at heading stage were significantly lower than other genotypes.Compared with the NPK treatment,the photosynthetic rate of the genotypes (Jiya2,T × 7000 and 7501B) were significantly declined at treatments of PK and NK (P ＜ 0.05),the genotypes (Jiya2 and 7501B) were significantly reduced at NP treatment (P ＜ 0.05).The decreasing amplitude of the photosynthetic rate of the genotype F44B in the treatments of PK and NK and the genotype T × 7000 in NP treatment were significantly lower than other genotypes.Compared with the NPK treatment,the N content in the treatment of PK and the P content in the treatment of NK were significantly reduced with these different genotypes of sorghum (P ＜ 0.05),and the decreasing amplitude of genotype F44B were significantly lower than other genotypes.The decreasing amplitude of grain weight per panicle,panicle weight and 1 000-grain weight of the genotypes F44B in the treatments of PK and NK and the genotype T × 7000 in NP treatment were the lowest among genotypes.The results indicated that the adaptability had significant genetic differences in the deficiency of N,P and K among different genotypes of sorghum.F44B genotype was resistant in both nitrogen and phosphorus,T × 7000 genotype was resistant in potassium.
sorghumdeficiency of N, P and Kbiological charactersnutrient uptakegrain yield
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