Ji Tingting, Lu Zhenya, Zhu Xiru, Li Hongxia, Shi Ruixue, Sun Yucui, Zhou Lingxiang, Wang Fang, Huang Chengdong, Zhang Fusuo
State Key Laboratory of Nutrient Use and Management, Key Laboratory of Plant-Soil Interactions, Ministry of Education, College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, China Agricultural University, Beijing 100193, China.
Research and Development Centre, Yunnan Yuntianhua Co., Ltd., Kunming 650000, China.
ACS Omega. 2025 Jan 21;10(4):4057-4067. doi: 10.1021/acsomega.4c10415. eCollection 2025 Feb 4.
Polyphosphate, which can improve crop yield and phosphorus use efficiency in calcareous soils, has gained increasing global attention. However, the effects of polyphosphate properties (pH and polymerization degree) on agronomic effects are still unclear. In this study, the nutrient solubility, nutrient release, nutrient uptake, and maize growth in calcareous soil of alkaline diammonium phosphate (DAP), acidic ammonium polyphosphate (APP) with a polymerization degree of 1.8, and alkaline potassium tripolyphosphate (KTPP) with a higher polymerization degree of 2.8 were evaluated. The results showed that KTPP at pH 8.0 could significantly increase the solubility of Ca by 24.3 times and 3.1 times than those by DAP and APP, respectively, and significantly increase the solubility of Mg by 172.8 times and 1.6 times than those by DAP and APP, respectively. The nutrient release experiment indicated 100% P was released after 15 d for the three P fertilizers, and the cumulative released amounts of soluble Ca and Mg with KTPP were about 2.9 and 3.2 times higher than those of DAP, respectively. The result of the pot experiment demonstrated that KTPP significantly enhanced shoot biomass by 24.1% compared with that by DAP. The P, Ca, and Mg uptake of maize shoots with KTPP significantly improved by 49.7%, 20.9%, and 20.9%, respectively, compared to that of DAP. However, no significant differences in yield or nutrient uptake between the KTPP and APP treatments were observed. This study demonstrated that polyphosphate with a higher polymerization degree had a better effect on increasing the solubility of cations, crop yield, and nutrient uptake, and polyphosphate application provides a synergistic interaction between P and Ca in calcareous soil, which may promote the application of polyphosphate fertilizers to expand to large-scale agriculture.
多聚磷酸盐能够提高石灰性土壤中的作物产量和磷利用效率，已受到全球越来越多的关注。然而，多聚磷酸盐性质（pH值和聚合度）对农艺效应的影响仍不明确。本研究评估了碱性磷酸二铵（DAP）、聚合度为1.8的酸性聚磷酸铵（APP）以及聚合度较高为2.8的碱性三聚磷酸钾（KTPP）在石灰性土壤中的养分溶解度、养分释放、养分吸收和玉米生长情况。结果表明，pH值为8.0的KTPP能使钙的溶解度分别比DAP和APP显著提高24.3倍和3.1倍，使镁的溶解度分别比DAP和APP显著提高172.8倍和1.6倍。养分释放实验表明，三种磷肥在15天后磷的释放率均为100%，KTPP的可溶性钙和镁的累积释放量分别比DAP高约2.9倍和3.2倍。盆栽实验结果表明，与DAP相比，KTPP显著提高了地上部生物量24.1%。与DAP相比，KTPP处理的玉米地上部对磷、钙和镁的吸收分别显著提高了49.7%、20.9%和20.9%。然而，KTPP和APP处理之间在产量或养分吸收方面未观察到显著差异。本研究表明，较高聚合度的多聚磷酸盐对提高阳离子溶解度、作物产量和养分吸收具有更好的效果，多聚磷酸盐的施用在石灰性土壤中提供了磷和钙之间的协同作用，这可能促进多聚磷酸肥料在大规模农业中的应用推广。
