保水耕作法的效益评比研究

Benefit Appraising of Water Conservation Tillage

用三种当地主要作物经过两年的试验表明，在定西半干旱地区，垄埂耕作、沟垄耕作、地膜垄埂耕作、秸杆覆盖耕作的小麦产量分别较对照提高了８．８０％、６．６３％、９．７４％和１９．３２％；胡麻产量分别提高４０．５４％、１８．９１％、４８．３８％和７５．６６％；洋芋产量分别提高２７．９４％、２５．００％、４４．１２％和７６．１４％。各种保水耕作措施均具有明显的积蓄径流、拦截泥沙的作用，秸秆覆盖耕作的水保效益最佳，其次为地膜垄埂耕作、沟垄耕作和垄埂耕作。各处理０～１００ｃｍ的土壤贮水量均显著地高于对照。

The experiment has carried out for two years in semi-aridarea of Dingxi district,in which three kinds of main regional cropswere used.Compared with the control,it Was found that the wheat yieldof ridge and earth dykc tillage,furrow and ridge tillage,ridge and earthdyke with plastic film tillage,and straw cover tillage were increased8.80%,6.63%,9.74%and 19.32%,respectively;flax yield of them wereincreased 40.54%, 18.91%, 48.38%and 75.66,respectively;potato yield ofthem were increased 27.94%,25.00%,44.12%and 76.14%,respectively.Allkinds of water conservation tillage measures had evident function ofeollecting run-off and intercepting silt.The straw cover tillage occupiedthe first place for gaining the water conservation benefits.The watercapacity stored in the soil of 0～100cm depth for the four tillage measuresused was obviously higher than that of the control