Effects of Organic Castor Meal Fertilizer on Peanut Yield and Soil Enzyme Activity
In order to investigate the effect of castor meal fertilizer on peanut yield and soil enzyme activity under different fertilization levels and clarify the optimal fertilization amount of castor meal fertilizer,the Silihong was used as the test variety.Seven fertilization treatment groups were set up,namely,no fertilization(CK),fertilizer(HF1,HF2,and HF3 of 175,350,and 700 kg/hm2),and organic castor meal fertilizer(BM1,BM2,and BM3 of 2 500,5 000,and 10 000 kg/hm2),so as to compare the effect of each treatment on peanut yield and soil enzyme activity.The results show that compared with CK,the BM2 and BM3 treatments increase yields by 0.35%-0.67%;the HF1,HF2,and HF3 treatments increase yields by 1.55%-4.44%;the peanut yield of the BM1 treatment is the highest,reaching 440.22 kg/667m2,which is an increase of 46.67%compared with that of the CK treatment.Moreover,the number of full fruits,100-fruit weight,and 100-kernel weight of the single plant with the BM1 treatment are all higher than those with other fertilization treatments.At the seedling stage,the activities of catalase,polyphenol oxidase,amylase,cellulase,protease,and dehydrogenase in the BM3 treatment are significantly lower than those in the CK treatment,while at the harvesting stage,the activities of the six enzymes in the BM3 treatment are significantly higher than those in other fertilization treatments.Therefore,the BM3 treatment has the most significant effect of changing soil enzyme activities compared with the CK treatment.In summary,the organic castor meal fertilizer of 2 500 kg/hm2 can increase peanut yield and improve economic benefits,the organic castor meal fertilizer of 10 000 kg/hm2 has the most obvious improvement effect on soil enzyme activities.
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