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首页> 外文期刊>Scientia Agricola >Soybean yield in response to application of phosphate rock associated with triple superphosphate.
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Soybean yield in response to application of phosphate rock associated with triple superphosphate.

机译：施用三重过磷酸钙导致的磷矿石响应大豆产量。

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Soybean (Glycine max L. Merrill) crop started to be planted in the Brazilian Cerrado in the 1970's, and this region currently contributes with 57% of total soybean production in Brazil. Under natural conditions in this region, the soils present chemical limitations such as low pH, low Cation Exchange Capacity, low nutrient availability, and moreover, clayey soils have a high P fixation capacity mainly due to high contents of Fe/Al oxides. Since P is the most limiting nutrient is this region, a study was performed in the state of Maranhao, Brazil, in a Typic Hapludox, with clayey texture and low available P (extracted by resin). Treatments were defined to evaluate soybean response to broadcast Arad phosphate rock (PR) plus banded triple superphosphate (TSP) and to evaluate the soybean response to three proportions of PR and TSP. The experiment was established in October 2004 and was carried out for three consecutive crop years (2004/05 to 2006/07). The associated use of PR and TSP, in several situations, resulted in yields at least similar to that obtained with the use of the water soluble P source and, in some cases, even using lower P rates. Regarding the "mixtures", a linear response was observed when they were banded; however, when they were broadcasted, no increase in yield was observed above 50% of relative solubility. In conclusion, the association of sources differing in solubility may be a feasible agronomic option for P fertilizer management of soybeans.
机译：1970年代开始在巴西塞拉多种植大豆（ L. Merrill），该地区目前占巴西大豆总产量的57％。在该地区的自然条件下，土壤表现出诸如pH值低，阳离子交换能力低，养分利用率低等化学限制，此外，粘土质土壤具有较高的固磷能力，这主要归因于高含量的Fe / Al氧化物。由于P是该区域中限制营养最多的养分，因此在巴西的Maranhao州，使用Typic Hapludox进行了一项研究，该粘土具有粘性质地，并且有效磷含量低（通过树脂提取）。定义了处理方法，以评估大豆对播种的Arad磷酸盐岩（PR）和带状三重过磷酸钙（TSP）的响应，并评估大豆对PR和TSP的三个比例的响应。该实验建立于2004年10月，并连续进行了三个作物年度（2004/05至2006/07）。在几种情况下，PR和TSP的联合使用所产生的产量至少与使用水溶性P源以及在某些情况下甚至使用较低的P比例所获得的产量相似。关于“混合物”，当它们捆扎在一起时观察到线性响应。然而，当它们广播时，在相对溶解度的50％以上没有观察到产率增加。总之，不同溶解度来源的关联可能是大豆磷肥管理的可行农艺选择。

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