Details

Autor(en) / Beteiligte

• Hui, Xiaoli
• Luo, Laichao
• Wang, Sen
• Cao, Hanbing
• Huang, Ming
• Shi, Mei
• Malhi, Sukhdev S.
• Wang, Zhaohui

Titel

Critical concentration of available soil phosphorus for grain yield and zinc nutrition of winter wheat in a zinc-deficient calcareous soil

Ist Teil von

• Plant and soil, 2019-11, Vol.444 (1/2), p.315-330

Ort / Verlag

Cham: Springer Science + Business Media

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Background and aims The decrease in cereal grain zinc (Zn) caused by phosphorus (P) application has attracted wide attention. However, optimizing P fertilization for both satisfactory grain yield and grain Zn concentration is still a problem due to a poor understanding of the relationship between P application rates and available soil P, and that of available soil P and soil Zn availability, relevant soil factors, and plant Zn uptake and utilization. Methods A location-fixed field experiment was initiated in 2004 with winter wheat ( Triticum aestivum L.) grown at five P rates of 0, 50, 100, 150, and 200 kg P 2 O 5 ha −1 , and soil and plant samples were collected during the three growing seasons of 2013–2016. Results Winter wheat grain yield increased, and the grain Zn concentration decreased with increasing available soil P in a linear-plus-plateau manner. The grain yield plateau, averaging 6009 ± 155 kg ha −1 , was reached at an available soil P concentration of 10.2 ± 2.5 mg kg −1 , and the grain Zn plateau, averaging 22.4 ± 0.9 mg kg −1 , was reached at an available soil P of 14.2 ± 1.8 mg kg −1 . Shoot Zn uptake after flowering was not affected, while Zn remobilization from vegetative parts to grains and the Zn harvest index increased with P application at available soil P levels below 11.6 mg kg −1 . The available soil Zn increased, and root mycorrhizal colonization was unaffected at lower available soil P levels. Conclusions The decrease in wheat grain Zn concentration with increasing P application at lower available soil P levels was primarily explained by yield dilution effects, not the changes in available soil Zn and root mycorrhizal colonization. Under the experimental conditions, the available soil P would have to be as low as 0.7 ± 0.4 mg kg −1 to achieve the target grain Zn concentration of 40 mg kg −1 , and at this level, the grain yield would only be 4127 ± 252 kg ha −1 .