The introduction of high-yielding varieties of seeds and the increase in cropping intensity has resulted in a significant rise in the extent of phosphorus removal by crops. Fertiliser phosphorus is, therefore, important in order to meet the crop requirements at various stages of growth. Though maintenance of a high level of phosphorus in the soil solution is difficult, fertiliser phosphorus is retained in the soil except by run-off or erosion. This residual fertiliser helps in building up the phosphorus level in the soil, a part of which becomes available to succeeding crops ( Fertiliser News , ISSN 0015-0266).
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/dose-phosphorus
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/soil-science
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/seeds
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rural-technology