Swain Sanatan Kumar, Kalidas-Singh Sagolshem, Puyam Anita, Thakuria Dwipendra, Maimom Soniya, Zhiipao R Rustum, Debnath Ashim, Bhuyan Samikhya, Homeshwari-Devi Mayanglambam, Huidrom Sangeeta, Tsomu Thupten, Umbrey Yashi, Bagang Punam, Ravat Vikas Kumar, Lap Bharati, Tangjang Avicha, S R Devegowda
School of Agriculture, Soil Science and Agricultural Chemistry, ITM University, Gwalior, MP, India.
Faculty of Agricultural Sciences, Rajiv Gandhi University, Doimukh, India.
Front Plant Sci. 2024 Mar 1;15:1304963. doi: 10.3389/fpls.2024.1304963. eCollection 2024.
Rhizospheric based phosphorus (P) fertilizer management is necessary for crop production due to environmental concerns caused by the overuse of the broadcasting method and limited P reserves. This study proposes a comparison of P management that enhances P nutrition in Chilli (variety: ) through seedling root-dipping (SRD) in P-enriched slurry (SSP-amended; pH of 8.1), micro-dose placement (MDP; drill and place closer to plant root), and full dose (187.6 mg kg) placement by broadcasting (FD). In SRD, seedlings were dipped in five different P concentrations (50, 100, 200, 300, and 400 mg PO kg) for varying durations (0, ½, 1, 2, 3, and 4 hours) and transplanted into pots (dipping in 0 mg PO kg consider as control), along with the MDP and FD treatments (total 33 treatments with 5 replications). [Seedlings dipped in 200, 300, and 400 mg PO kg died within a week after transplanting, thus were excluded from further analysis]. The amount of P received in MDP and FD were 21-90 times higher than P adhesion to seedling roots in SRD treatments. Root volume was in order SRD>MDP>FD. Seedlings dipped in 100 mg PO kg for 2 hours in SRD exhibited the highest biomass production, P-use and -recovery efficiency; and showed an increase of 52%, 178%, and 293% in FD, MDP, and SRD compared to the control respectively. It is recommended to use the SRD method with other P sources in reduced amount to maintain the native P pool in soil, and further multilocational trials are needed to validate.
由于撒施方法过度使用导致的环境问题以及磷储备有限，基于根际的磷肥管理对于作物生产而言是必要的。本研究提出了一种磷肥管理的比较方法，即通过在富含磷的泥浆（过磷酸钙改良；pH值为8.1）中进行幼苗浸根（SRD）、微剂量施肥（MDP；钻孔并靠近植物根系施肥）以及撒施全剂量（187.6毫克/千克）（FD），来提高辣椒（品种：）的磷营养。在SRD中，将幼苗浸入五种不同的磷浓度（50、100、200、300和400毫克P₂O₅/千克）中不同时长（0、½、1、2、3和4小时），然后移栽到花盆中（浸入0毫克P₂O₅/千克视为对照），同时进行MDP和FD处理（共33个处理，每个处理重复5次）。[浸入200、300和400毫克P₂O₅/千克的幼苗在移栽后一周内死亡，因此被排除在进一步分析之外]。MDP和FD处理中获得的磷量比SRD处理中幼苗根系吸附的磷高21 - 90倍。根体积顺序为SRD>MDP>FD。在SRD中浸入100毫克P₂O₅/千克2小时的幼苗表现出最高的生物量产量、磷利用和回收效率；与对照相比，FD、MDP和SRD处理分别增加了52%、178%和293%。建议使用SRD方法并减少其他磷源的用量，以维持土壤中的天然磷库，并且需要进一步的多点试验来验证。
