Effects of ridge-furrow rainfall harvesting with mulching on roots characteristic and fodder yield of sainfoin
[Objective]In order to select environmentally friendly mulching materials in ridge-furrow rainwater harvesting system(RFRH)and to increase rainwater utilization in a semiarid region of Northwest China.[Method]A field experiment was conducted using a randomized complete design to determine effects three ridge-mulching ma-terials(manually compacted soil(SR),biodegradable film(BR),and plastic film(PR))on soil water storage,top-soil temperature,root characteristics(length,surface area,volume,and weight of roots)and nodule characteristics(number and weight of root nodules),fodder yield,and water use efficiency(WUE)of sainfoin in 2016,using tradi-tional flat planting(TP)as a control.[Result]The results showed that the practice of RFRH,especially BR and PR,resulted in increased soil water storage at furrow bottoms and topsoil temperature at ridge tops,and improved root and nodule characteristics of sainfoin.SR increased WUE,but decreased fodder yield.BR and PR increased fod-der yield and WUE.Compared with TP,the soil water storage increased by 10.64,9.36 and 2.09 mm,respectively.Topsoil temperature at ridge tops increased by 2.0,3.4 and 4.2℃respectively.Dry root weight increased by 27%,72%and 87%respectively.WUE increased by 11.9,23.3 and 30.0 kg/(hm2·mm)during the sainfoin growth sea-sons,respectively for SR,BR and PR.The fodder yield for SR decreased by 13%,but the fodder yield for BR and PR increased by 11%and 23%,respectively.Intensive use of plastic films in agro-ecosystems had raised considerable concerns due to the increasing film residues in soils.[Conclusion]The ridge furrow rainwater harvesting mulching with biodegradable film was a suitable tillage technology for sainfoin production in semi-arid regions.
biodegradable filmsainfoinroot nodulefodder yieldwater use efficiency
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