Hashmi Zafar Ul Haq, Khan Muhammad Jamal, Akhtar Muhammad, Sarwar Tahir, Khan Mohammad Jamal
Department of Water Management, University of Agriculture, Peshawar, Pakistan.
Nuclear Institute for Agriculture and Biology (NIAB), Faisalabad, Pakistan.
J Sci Food Agric. 2017 Apr;97(6):1733-1739. doi: 10.1002/jsfa.7921. Epub 2016 Sep 13.
Low phosphorus (P) availability to wheat from commercial fertilizers is one of the reasons for lower grain yield and hence justifies search for more efficient P source under alkaline calcareous soils.
Phosphoric acid (PA) and diammonium phosphate (DAP), applied through conventional and modified methods, were assessed for P supply and wheat yield in a calcareous soil. Under laboratory conditions, pre-incubated soil with 70 mg P kg soil as PA and DAP was assessed for solution P (C ) for 4 weeks. Phosphorus sorption data were fitted using the Freundlich model for describing analyzed sorption in soil incubated with or without DAP and PA. The fitted model equations exhibited comparatively higher effluxes of P from the solution system in control treatment. Compared to DAP, lower quantities (19.6%) of P for PA-treated soil were required for producing optimum P concentration in soil solution, i.e. 0.2 mg P L . The greenhouse study involved P tracer technique to quantify the proportion of applied P derived by wheat from fertilizer or soil. The results showed that P derived from fertilizer was highest (47.5%) in PA placement, while the lowest (31.5%) was in DAP broadcast treatment. The field study also showed similar trends to that of the greenhouse study. The PA placement treatment resulted in highest (23.4%) phosphorus use efficiency, whereas the lowest one (17.1%) was recorded for DAP broadcast treatment.
PA proved to be a better P source than DAP for improving P content and achieving higher yield and recovery of applied P by wheat grown in alkaline calcareous soils. © 2016 Society of Chemical Industry.
商业肥料中可被小麦利用的低磷含量是导致谷物产量降低的原因之一，因此有必要在碱性石灰性土壤中寻找更有效的磷源。
通过常规和改良方法施用的磷酸（PA）和磷酸二铵（DAP），在石灰性土壤中进行了磷供应和小麦产量评估。在实验室条件下，以每千克土壤70毫克磷的PA和DAP对预培养土壤进行了4周的溶液磷（C）评估。使用Freundlich模型对磷吸附数据进行拟合，以描述在添加或不添加DAP和PA的土壤中分析的吸附情况。拟合模型方程显示，对照处理中溶液系统的磷流出量相对较高。与DAP相比，PA处理的土壤产生土壤溶液中最佳磷浓度（即0.2毫克磷/升）所需的磷量较低（19.6%）。温室研究采用磷示踪技术来量化小麦从肥料或土壤中吸收的施用磷的比例。结果表明，PA条施处理中来自肥料的磷最高（47.5%），而DAP撒施处理中最低（31.5%）。田间研究也显示出与温室研究类似的趋势。PA条施处理的磷利用效率最高（23.4%），而DAP撒施处理的最低（17.1%）。
对于在碱性石灰性土壤中生长的小麦，PA被证明是比DAP更好的磷源，可提高磷含量，实现更高的产量和施用磷的回收率。© 2016化学工业协会。
