Impact of intercropping green manure on saline-alkali soil characteristics and silage maize yield
Improving saline-alkali land holds significant importance for food security and optimal land resource utilization in China.To address the impact of intercropping with green manure on soil improvement and crop yield in saline-alkali land,a three-year field experiment was conducted from 2019 to 2021 in moderately saline-alkali land in Shanyin County,Shuozhou City,Shanxi Province.Five treatments were implemented:maize monoculture without fertilizer application(CK),chemical and organic fertilizer application(desulfurized gypsum,straw biochar,compound fertilizer(N-P2O5-K2O:28-15-15))+maize monoculture(L),chemical and organic fertilizer application+intercropping with two rows of green manure using Vicia villosa Roth.(LC1),chemical and organic fertilizer application+intercropping with three rows of green manure(LC2),and chemical and organic fertilizer application+intercropping with four rows of green manure(LC3).Results indicated that,compared with the L treatment,the treatments LC1,LC2,and LC3 increased soil organic matter and total nitrogen by 2.34%～4.45%and 22.46%～33.80%,and reduced soil pH and salt content by 1.00%-2.27%and 17.43%～21.64%,respectively.Maize yield significantly increased from 6.76%～8.54%,with the best improvement observed in LC2.Considering all aspects,LC2 treatment,along with mulching and reintegration into the field,merges as a potent method for ameliorating saline-alkali soils,enhancing soil fertility,and elevating crop yield.This approach holds promise as a holistic strategy for reclaiming and optimizing the utilization of saline-alkali land.
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