College of Agriculture, Can-Tho University, Can Tho, Vietnam.
PeerJ. 2023 Feb 2;11:e14803. doi: 10.7717/peerj.14803. eCollection 2023.
The available phosphorus (P) in acid sulfate soils (ASSs) is low because of fixation by aluminum (Al) and iron (Fe), resulting in decreased P use efficiency and crop yield. At present, the use of dicarboxylic acid polymer (DCAP) coated on P fertilizer is expected to improve P use efficiency and plant productivity. However, the influence of DCAP on P solubility and on the yield of sweet potato cultivated in acidic soils has not been elucidated. Thus, the aimed of this study was to evaluate the effect of the use of DCAP-coated P fertilizer on the availability and nutrient uptake of P as well as the yield of sweet potato. Under the greenhouse condition, the use of DCAP significantly improved P availability (~3 mg P kg), increasing tuber diameter and length by ~0.5 and ~1.0 cm, respectively. Thus, the productivity of sweet potato in the treatment 40-kg PO and 60-kg PO ha coated with DCAP was higher by about 100 g pot than that in the same rate of P fertilizers (40- and 60-kg PO ha) not coated with DCAP. In the field experiment, P accumulation (82.7 kg PO ha) and tuber yield (22.0 t ha) in the treatment of DCAP-coated with 60-kg PO ha were not significantly different compared with that in the treatment of 80-kg PO ha (82.1 kg PO and 21.7 t ha, respectively). Furthermore, the use of DCAP combined with 75% P fertilizer increased the P availability by the same amount as that with the use of 100% P fertilizer. Hence, the use of DCAP reduced about 25% of the chemical P fertilizer applied in soil.
酸性硫酸盐土壤（ASS）中可用磷（P）含量低，因为它被铝（Al）和铁（Fe）固定，导致 P 利用率和作物产量降低。目前，预计使用涂覆在磷肥上的二羧酸聚合物（DCAP）可以提高 P 的利用率和植物生产力。然而，DCAP 对 P 溶解度以及在酸性土壤中种植的甘薯产量的影响尚未阐明。因此，本研究的目的是评估使用 DCAP 涂覆的磷肥对 P 的有效性和养分吸收以及甘薯产量的影响。在温室条件下，使用 DCAP 可显著提高 P 的有效性（~3 mg P kg），分别使块茎直径和长度增加约 0.5 和 1.0 cm。因此，与未涂覆 DCAP 的相同 P 肥料（40- 和 60-kg PO ha）处理相比，涂覆 40-kg PO 和 60-kg PO ha 的 DCAP 的处理中，甘薯的生产力提高了约 100 g 盆。在田间试验中，与 80-kg PO ha 处理（分别为 82.1 kg PO 和 21.7 t ha）相比，60-kg PO ha 处理的 DCAP 涂覆的 P 积累量（82.7 kg PO ha）和块茎产量（22.0 t ha）并没有显著差异。此外，与使用 100%P 肥料相比，使用 DCAP 结合 75%P 肥料可提高相同数量的 P 有效性。因此，DCAP 的使用可减少约 25%施用于土壤的化学 P 肥料。
