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Northwest University of Science and Technology (2009)

Effect of Conservation Tillage Technology on Soil Properties and Crop Growth in the Dryland of South Ningxia Region

侯贤清; Hou Xian Qing

Titre : Effect of Conservation Tillage Technology on Soil Properties and Crop Growth in the Dryland of South Ningxia Region

Auteur : 侯贤清; Hou Xian Qing

Grade : Master’s Theses 2009

Université : Northwest University of Science and Technology

Résumé partiel
According to natural conditions of small amount of rainfall, unequal season distribution and great amount of evaporation in the semi arid region.The technological core of agricultural development is saving soil water, improving water environment around the roots of crop, and then taking high efficient water use measures to achieve resource utilization of rainfall. To improve soil physical property and chemical property, enhance the capacity of saving soil water and improve crop yield and WUE, the study designed two different techniqual plans---Strip fallow rotation planting with equal height on sloping farmland and different tillage practices in summer fallow period on flat farmland in the arid areas of South Ningxia.The main results on soil physical property and chemical property, soil enzyme activity,crop yield and WUE were summarized as follows:1. Strip rotation planting was beneficial to regulate soil pH in 0-40cm layer, lower soil bulk density,in favor of the root system on soil water and nutrient absorption. Dry flatland deal with subsoiling significantly reduced soil bulk density in 0-20cm layer. no-tillage and conventional tillage increased surface bulk density, indicated that subsoiling could effectively break the plow pan, increase soil permeability. Diffierent conservation tillage practices could decrease soil pH and soil bulk density,enhance soil capillary porosity and soil water-stable aggregate in different diameter, and improve soil composition. All soil levels under three kinds of tillage treatments led > 0.25mm number of soil aggregates more than 55%, and subsoiling could increase the number of elastic-stable aggregate in 10 20cm layer 3.05% higher than CT, make 20 30cm soil layer increase 6.02%, make 30-40cm soil layer increase 6.01%. Different tillage practices would lead the content soil aggregates different in spatial variation : no-tillage was beneficial to the formation of soil aggregates in 0 10cm and 20 30cm layers ; subsoiling increased the content of water-stable aggregates in 30 40cm layer, reduced the content of water-stable aggregates in 10 30cm layer.2. Strip rotation plannting could lower the water loss of sloping farmland efficiently,and the water storage increased quickly. when planted in the second year of winter wheat harvesting stage, the soil moisture of two fallow areas treatments were all higer than CK1(conventional rotation planting every other year), so it provided better soil water for succeeding crop growth. And at the same time, strip rotation planting could prevent the loss, run-off and surface nutrient of soil coused by storm, enhance the capacity of saving soil water on sloping farmland. The effect of saving soil water by rainfall is obvious in different tillage practices—subsoiling and conventional tillage in summer fallow period, and impove soil moisture condition of winter wheat in different growth stage.3. The subsoiling and conventional tillage could save soil water effectively to rainfall during the summer fallow period, so as to enhance soil water storage before sowing.Compared with no-tillage,the infiltration rate of subsoiling and conventional tillage to mainten soil water were extremely significant , and the subsoiling was higher than conventional tillage by 0.97%. During summer terminal stage, the soil water storage of the subsoiling and no-tillage in 0~200cm soil layer was higher than conventional tillage, which is 8.23mm and 1.61mm respectively. Compared with conventional tillage, the soil water could be improved by subsoiling and no-tillage during seedlings period of winter wheat,

Mots clés : Article pulley species Tillage, subsoiling , plowing Soil Properties Yield Water use efficiency

Présentation (CNKI)

Page publiée le 30 septembre 2014, mise à jour le 16 février 2018