期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Research on Modification of Non-limiting Water Range of Soil
1
作者 迟春明 《Agricultural Science & Technology》 CAS 2013年第11期1620-1623,1628,共5页
[Objective] The paper was to study and modify non-limiting water range (NLWR) of soil. [Method] The water content when total soil water potential was -0.3 MPa or soil mechanical resistance was 0.85 MPa was selected ... [Objective] The paper was to study and modify non-limiting water range (NLWR) of soil. [Method] The water content when total soil water potential was -0.3 MPa or soil mechanical resistance was 0.85 MPa was selected as the lower limit of NLWR to replace the original water content of permanent wilting point or the water content under soil mechanical resistance of 2.0 MPa. NLWR could be calculated us-ing the minimum value of upper limit minus the maximum value of lower limit. [Re-sult] Compared with original NLWR or least limiting water range (LLWR), the modi-fied NLWR had more practical significance. When Db〉Db-thr, soil physical properties hindered the growth of crops, so the soil should be improved; when Db〉Db-thr, soil physical properties hindered the growth of crops, so-the soil should be improved; wtlen Db〈Db-thr, as long as the soil water content is within NLWR, soil physical properties had no effect on crop growth. NLWR at this time could be used as the basis for irrigation man- agement in farmland. [Conclusion] The study provides theoretical support and scientific basis for relevant researches about evolution rule and regulatory mechanisms of soil physical quality, relationship between soil physical quality and crop growth and yield, water-fertilizer-salt management of soil. 展开更多
关键词 Field water capacity Critical point of aeration Critical point of waterpotential Critical point of mechanical resistance
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部