Impacts and Evalution of Earthworm Manure Partial Substitution for Chemical Fertilizer on Continuous Cropping Tobacco Field Soil Fertility

doi:10.7668/hbnxb.2018.S1.038

Abstract

Abstract: In order to make rational use of earthworm manure instead of some chemical fertilizer,improving the utilization efficiency of chemical fertilizer and soil quality in tobacco growing area of Southern Shaanxi.A field experiment with five treatments:CK (no fertilizer),T1 (chemical fertilizer),T2 (nitrogen fertilizer nitrogen replacement 30% earthworm manure),T3(nitrogen fertilizer nitrogen to replace 50% earthworm manure),T4(nitrogen fertilizer nitrogen replacement 70% earthworm manure).We studied the effects of different fertilization treatments on the physicochemical properties,enzyme activity and microorganism of tobacco planting soil,and analyzed the correlation of various fertility factors,and comprehensively evaluated the soil fertility level.The results showed that without fertilizing or applying earthworm manure,soil bulk density could be reduced significantly.Compared with pure fertilizer treatment (T1),no fertilizer treatment (CK) decreased 2.38%,and earthworm manure treatment (T2,T3 and T4) decreased 3.17%-6.35%.Fertilization could significantly increase soil available nutrients and organic matter content.The effect of T2 treatment on soil quick effective nutrients was the best,compared with CK treatment soil alkaline nitrogen,available phosphorus and available potassium,respectively,2.63,1.38 and 0.99 times more.The content of organic matter increased with the increased of the proportion of earthworm manure.The highest T4 content reached 22.35 g/kg,which was 62.07% higher than that of CK treatment.The replacement of some fertilizer by earthworm manure could significantly increase the biological characteristics of soil,and the activity of T1 urease,invertase,acid phosphatase and catalase increase 16.45%-37.97%,22.99%-34.57%,18.40%-28.80% and 10.19%-19.74%,respectively.While the number of bacteria,fungi and actinomycetes increased by 43.22%-122.35%,20.74%-55.87% and 44.80%-76.64% respectively.There was a certain correlation between the fertility factors.The principal component analysis showed that the first principal component reflected the transformation ability of soil organic matter,and the second principal component represented the supply capacity of soil available nutrients.The comprehensive model showed that the difference of the effect of earthworm feces partly replaced by inorganic fertilizer on soil comprehensive fertility was mainly reflected in available potassium,available phosphorus,alkali hydrolysable nitrogen,actinomycetes,fungi,acid phosphatase,bacteria and organic matter.Soil comprehensive fertility evaluation showed that T4 (earthworm manure nitrogen instead of 70% fertilizer nitrogen) was the best,and T2 (earthworm manure nitrogen instead of 30% fertilizer nitrogen) was the second.

Key words: Earthworm manure, Tobacco, Soil nutrient, Fertility evaluation

CLC Number:

LI Sitong, MAO Kailun, WEI Chengcai, YUAN Shuai, MU Yaohui, WANG Pingping, ZHANG Lixin. Impacts and Evalution of Earthworm Manure Partial Substitution for Chemical Fertilizer on Continuous Cropping Tobacco Field Soil Fertility[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2018, 33(S1): 238-245. doi: 10.7668/hbnxb.2018.S1.038.

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