Eztra Supply of Calcium Is Not Required for Mazimal Root Growth in the Nitrate and Phosphorus-rich Patch in an Acid Soil

摘要：

Subsurface acidity is a major concern in agricultural soils. Surface application of lime is not effective and therefore altemative approaches are being tested to combat subsurface acidity. The supply of NO3 increases excess anion uptake and results in rhizosphere alkalisation which can use as a method of biological amelioration. A glasshouse study was conducted with wheat to examine the effect of localised supply of P and Ca alone or combination with NO3-on subsurface root proliferation and rhizosphere alkalisation in an acid soil. The results show that localised supply of NO3- plus P in the subsurface maximises root proliferation without extra Ca supply.

关键词： Nutrient banding Heterogeneity Soil management Triticum aestivum N uptake

作者: Chandrakumara Weligama Caixian Tang Peter W.G.Sale Mark K.Conyers De Li Liu

作者单位: Department of Agricultural Sciences,La Trobe University,Melbourne,Victoria 3086,Australia NSW Department of Primary Industries (EH Graham Centre for Agricultural Innovation),Wagga Wagga Agri

会议类型: 国际会议

会议名称: The International Symposium of Molecular Environmental Soil Science at the Interfaces in the Earths Critical Zone(地球关键区界面反应：分子水平环境土壤科学国际会议)

会议地点: 杭州

会议语种:英文

页码: 167-169

在线出版日期: 2009-10-10（万方平台首次上网日期，不代表论文的发表时间）