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Effects of phosphorus application in different soil layers on soil phosphorus fractions and the root of Platycodon grandiflorum
Journal of Plant Nutrition ( IF 1.6 ) Pub Date : 2021-06-28 , DOI: 10.1080/01904167.2021.1943433
Chunmei Ge 1 , Lixiang Zhu 2 , Jie Wang 2
Affiliation  

Abstract

The enhancement of phosphorus (P) acquisition through deep P application has been documented in crops with fibrous root systems, but little is known about this effect on the morphology of a taproot system. A four-year field experiment with P application was conducted using Platycodon grandiflorum with a taproot system as the experimental material at two P rates of 40 and 60kg ha−1 with middle and deep P application patterns. The biomass and P accumulation of P. grandiflorum were greater with deep P application than with middle P application at the same P rate. Regardless of whether the root diameter being greater or less than 2mm, the root length, volume and surface area of P. grandiflorum increased due to P application, and they were greater with deep P application than with middle P application at the same P rate. Four-year consecutive P application increased the concentrations of soil NaHCO3-P, HCI-P, NaOH-P and residual-P, resulting in soil P accumulation, especially HCI-P. This is the first report that deep P application was more favorable to the growth of P. grandiflorum with a taproot system than middle P application. And this research provided evidence that deep phosphorus application is also suitable to crops with a taproot system.



中文翻译:

不同土层施磷对桔梗土壤磷含量及根系的影响

摘要

已经在具有纤维根系统的作物中记录了通过深施磷来增强磷 (P) 的获取,但对这种对主根系统形态的影响知之甚少。使用具有主根系统的桔梗作为试验材料,以 40 和 60 kg ha -1两种磷肥施用量进行了为期四年的磷肥田间试验,并采用中深磷肥模式。相同施磷量下,深施磷的大花生物量和磷积累量大于中施磷。无论根径大于或小于 2 mm,大花的根长、体积和表面积由于施磷而增加,并且在相同的施磷率下,深施磷大于中施磷。连续4年施磷增加了土壤NaHCO 3 -P、HCI-P、NaOH-P和残留P的浓度,导致土壤P积累,尤其是HCI-P。这是首次报道深施磷比中施磷更有利于主根系统桔梗的生长。而这项研究提供的证据表明,深施磷也适用于具有主根系统的作物。

更新日期:2021-06-28
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