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《Agricultural Research in the Arid Areas》 1991-04
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A Study on Tillage Measure for Soil Water Storage and Conservation in Rainfed Wheat Fields

Gao Xuke;Wang Xiaobin;Wang Deshui;Zeng Lingwen(Soil and Fertilizer Research Institute,CAAS,Beijing)Wang Wenqing(Agricultural Burea of Tunliu County)  
Three years'experiments conducted in rainfed agricultural semihumid arealiable to drought showed that wheat yield in rainfed land was closely relatedto base moisture in soil.In the case of limited rainfall,improving base mois-ture in soil.is a key link in raising wheat yield in rainfed land.Subsoilingduring the fallow period can break plowpans and deepen the plow layers andimprove,soil physical properties so as to raise moisture permeability duringraining season.in this way,the available water content in 2-meter-deep soillayer can increase 13.8-48.9 mm higher than that in soil by the conventionalplowing in sowing time.Based on different tillage methods and with strawmulching,the available moisture in soil(only 0-60 cm deep)prior to wheatsowing increased 19.1 mm on an average higher than that in soil withoutmulching.It is estimated that when sowing,there is and crease of every 10 mmof available water in soil,wheat yield increase will be 8.2~11.8kg/mu.Re-search indicates that subsoiling,fallow and mulching are the important water-sawing measures to store a and ao serve soil moisture and to tap rainfall poten-tial in rainfed wheat welds,Also,subsoiling in fallow land can be carriedout every over year.
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