Agronomic Evaluation of Calcined Crandallite from Three Brazilian Phosphate Deposits
Agronomic Evaluation of Calcined Crandallite from Three Brazilian Phosphate Deposits
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巴西三个磷酸盐矿床中的煅烧霞石的农艺评价
DOI：
10.1080/00103620701826852
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
J. Pereira
中科院分区：
文献类型：
--
作者：
E. Francisco;L. Prochnow;M. Toledo;J. Pereira
摘要对巴西Tapira、Catalao和Juquia三个磷酸盐矿床的风化地幔中含有辉钼矿的样品进行了表征、煅烧和农艺评价。煅烧过程提高了各样品的总磷(P)和中性柠檬酸铵可溶性磷（NAC）含量。原始Tapira， Catalao和Juquia的NAC溶解度约为总P的5%，而煅烧样品的NAC溶解度分别为54%，16%和53%。在一项温室研究中，从煅烧材料和MCP（磷酸单钙）中分别施用0、10、20、40、80和120 mg P kg - 1的磷，与旱地和淹水水稻一起种植Ultisol作物，持续65天。结果表明，随着施磷量的增加，两种作物的干物质产量和磷吸收量均增加。Tapira和Juquia对淹水水稻比旱地水稻更有效。Tapira、Catalao和Juquia对MCP的相对农艺效率计算值分别为57、48和53%。
Abstract Samples from the weathering mantle containing crandallite of three Brazilian phosphate deposits, Tapira, Catalao, and Juquia, were characterized, calcined, and agronomically evaluated. The calcination process increased total phosphorus (P) and neutral ammonium citrate soluble (NAC) P contents of all samples. The NAC solubility of original Tapira, Catalao, and Juquia was about 5% of total P, whereas for calcined samples it was 54, 16, and 53%, respectively. In a greenhouse study, rates of P were applied at 0, 10, 20, 40, 80, and 120 mg P kg−1 from the calcined materials and MCP (monocalcium phosphate) to an Ultisol cropped with upland and flooded rice for 65 days. The results showed that the calcined P samples increased dry‐matter yield and P uptake with increasing rates of P applied for both crops. Tapira and Juquia were more effective for flooded than for upland rice. The calculated values of relative agronomic effectiveness of Tapira, Catalao, and Juquia with respect to MCP were 57, 48, and 53%...