Prediction of wheat response to an application of phosphorus under field conditions using diffusive gradients in thin-films (DGT) and extraction methods
Prediction of wheat response to an application of phosphorus under field conditions using diffusive gradients in thin-films (DGT) and extraction methods
复制标题
DOI：
10.1007/s11104-010-0521-0
复制
发表时间：
2010-12-01
期刊：
影响因子：
4.9
通讯作者：
Zhang, Hao
中科院分区：
文献类型：
--
作者：
Mason, Sean;McNeill, Ann;Zhang, Hao
研究了用薄膜扩散抑制剂（DGT）技术和其它两种已建立的试验方法（科尔韦尔，树脂）预测澳大利亚南部35个田间试验中小麦对施磷反应的能力。相对早期干物质生产和籽粒产量反应的回归分析表明，DGT方法预测植物对施磷的反应更准确地比科尔韦尔P和树脂P在最大产量达到与P率使用的网站（20 35）。在DGT表面的土壤中测得的浓度，C（DGT），解释了74%的早期干物质和粮食的响应变化，相比之下，7%的早期干物质和35%的粮食使用树脂P的方法。没有显着的关系，可以得到科尔韦尔P虽然修改科尔韦尔测试数据，磷缓冲指数导致正确的响应预测为11的20个现场相比，18 DGT和14树脂P。这些观察结果表明，DGT技术可以评估植物有效磷在土壤中具有显着更大的准确性比传统的土壤磷测试方法。磷的临界阈值用C（DGT）表示，早期干物质为255 μ g L（-1），籽粒为66 μ g L（-1）。
The ability of the Diffusive Gradients in Thin Films (DGT) technique and two other established testing methods (Colwell, resin) to predict wheat responsiveness to applied P from 35 field trials across southern Australia was investigated. Regression analysis of relative early dry matter production and grain yield responses demonstrated that the DGT method predicted plant responsiveness to applied P more accurately than Colwell P and resin P at sites where maximum yields were reached with P rates used (20 out of 35). The measured concentration in soils at the DGT surface, C(DGT), explained 74% of the variation in response for both early dry matter and grain, compared to 7% for early dry matter and 35% for grain using the resin P method. No significant relationships could be obtained for Colwell P although modifying the Colwell test data using Phosphorus Buffering Index resulted in a correct response prediction for 11 of the 20 field sites compared to 18 for DGT and 14 for resin P. These observations suggest that the DGT technique can assess plant available P in soils with significantly greater accuracy than traditional soil P testing methods. The critical P threshold, expressed as C(DGT), was 255 mu g L(-1) for early dry matter and 66 mu g L(-1) for grain.