麦草覆盖免耕栽培马铃薯调亏灌溉技术试验研究

2008~2009年在甘肃民乐县洪水河灌区进行了麦草覆盖免耕栽培马铃薯调亏灌溉大田试验,结果表明:麦草覆盖马铃薯栽培苗期进行轻度水分胁迫,处理的产量较覆盖充分灌溉处理没有显著降低,而马铃薯的水分利用效率、干物质、淀粉以及维生素C含量都与其它处理间存在差异,其值均达到了最大,分别为7.41 kg/m3、22.41%、15.44%1、4.56 mg/100g鲜薯;同时麦草覆盖栽培充分灌溉处理产量等各项指标均优于常规土壤起垄种植充分灌溉处理,说明该技术能更有效地提高作物水分利用效率(WUE),改良块茎品质,提高产量,且幼苗期轻度水分亏缺是覆盖马铃薯调亏灌溉的最佳时期和调亏程度。

Study on regulated deficit irrigation technology for potato covered by straw without tillage

A field experiment was conducted in Hongshuihe River irrigation district in Minle of Cansu in 2008~2009 to study regulated deficit irrigation technology for potato covered by straw without tillage. The results showed that the yield of straw-covered potato with light water deficit in the seedling stage has no significant decrease compared to that with full irrigation, while the water use efficiency(WUE), dry matter, starch and vitamin C content of straw. covered potato with light water deficit are different from those under other treatments and all the values of these items reach the maximum as 7.41 kg/m³, 22.41%, 15 .44% and 14. 56 mg/100g fresh potato, respectively. At the same time, the yield and other indexes of straw covered potato under full imigation treatment are superior to those under full irmigation in soil ridge treatment of conventional cultivation. All these show that regulated deficit irigation technology can improve more effectively crop WUE and ameliorate tuber quality and increase yield, and light water deficit in seedling stage is the best period and extent of deficit.