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首页> 外文期刊>The Kasetsart Journal >Equations for Estimating Phosphorus Fertilizer Requirements from Soil Analysis for Maize (Zea mays L.) Grown on Alfisols of Northwestern Ethiopia
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Equations for Estimating Phosphorus Fertilizer Requirements from Soil Analysis for Maize (Zea mays L.) Grown on Alfisols of Northwestern Ethiopia

机译：从土壤分析分析埃塞俄比亚西北部种植的玉米粉中玉米（Zea mays L.）的磷肥需求量方程

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Field and laboratory experiments were conducted to develop equations for estimating phosphorus fertilizer requirements of maize on Alfisols of Northwestern Ethiopia. The field experiment on 20 sites was arranged in randomized complete block design with five fertilizer rates and four replications. At maturity, three central rows were harvested and yield and yield components data were collected. Laboratory analysis of soil samples was conducted following chemical soil analysis methods: Bray-1, Bray-2, Olsen, Mehlich-1, anion exchange resin and extraction with 0.01N CaCl_2. Parameters of the Quantity/Intensity relationships were also determined. Reliable methods were identified by fitting relative grain, relative dry biomass and P yields in a double log curvilinear regression model and those availability indices giving superior correlation were selected. Consequently, grain yield data and phosphorus availability indices were fitted into the Mitscherlich-Bray model to develop fertilizer recommendation equations. Results of the experiment revealed that among the methods giving quantity of available P, Bray-2 and Olsen methods gave the most reliable indices. Moreover, the intensity parameters in combination with the quantity parameters gave slightly superior correlation coefficient with yield parameters compared with their individual effects. The equations developed for estimating P fertilizer requirements of maize from soil analysis were: (a) log (100 - y) = 2 - 0.1468b - 0.007546x and (b) log (100 - y) = 2 -0.1167b - 0.007546x for Olsen and Bray-2 methods, respectively, where y was desired relative grain yield (%); b was soil P availability index (mg kg~(-1)); and x was P fertilizer requirement (kg ha~(-1)). The two equations were statistically proven to provide equally reliable estimates of P fertilizer requirement of maize on Alfisols of Northwestern Ethiopia.
机译：进行了野外和实验室实验，以开发估算西北埃塞俄比亚Alfisol上玉米磷肥需求量的方程。在20个地点进行的田间试验以随机的完整区组设计进行安排，采用5种肥料和4种重复肥料。成熟时，收获三排中央，收集产量和产量成分数据。按照化学土壤分析方法对土壤样品进行实验室分析：Bray-1，Bray-2，Olsen，Mehlich-1，阴离子交换树脂并用0.01N CaCl_2萃取。还确定了数量/强度关系的参数。通过在双对数曲线回归模型中拟合相对谷物，相对干生物量和磷产量来确定可靠的方法，并选择那些具有较高相关性的可用性指标。因此，将谷物产量数据和磷有效性指数拟合到Mitscherlich-Bray模型中，以开发肥料推荐方程。实验结果表明，在给出可用磷量的方法中，Bray-2和Olsen方法给出了最可靠的指标。此外，强度参数与数量参数的组合与它们的个别效果相比，与屈服参数的相关系数稍高。通过土壤分析估算玉米的磷肥需求而开发的公式为：（a）log（100-y）= 2-0.1468b-0.007546x和（b）log（100-y）= 2 -0.1167b-0.007546x分别用于Olsen和Bray-2方法，其中y是期望的相对晶粒产率（％）； b为土壤磷有效性指数（mg kg〜（-1））； x为磷肥需求量（kg·ha〜（-1））。这两个方程在统计学上得到了证明，可以为埃塞俄比亚西北部的Alfisol上的玉米P肥料需求量提供同样可靠的估计。

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