Abstract
Calcium polypeptides (CPPs) prepared from agricultural wastes can provide nutrients to plants, promote plant growth, and
reduce accumulation of heavy metals in vegetables. In this study, a field experiment including three treatments, normal
fertilization control, reduced fertilization by 40% (RF-40), and reduced fertilization by 40% with dressing of 7.5 kg/666.67 m2
CPPs (RF-40-CPPs), was conducted to investigate the effects of CPPs on wheat yields, grain properties, and rhizosphere soil
microbial communities. Compared with the control, after reducing chemical fertilizer application by 40%, the yields, protein
contents, wet gluten contents, and amino acid contents of RF-40 wheat grains were clearly decreased by 14.51%, 1.54%,
5.03%, and 19.58%, respectively. Interestingly, compared with RF-40, after CPP application, the yields, 1000-grain weights,
protein contents, wet gluten contents, and amino acid contents of RF-40-CPPs were clearly increased by 11.53%, 20.28%,
1.66%, 5.39%, and 22.91%, respectively. Surprisingly, compared with the control grains, the RF-40-CPPs grains exhibited
increases of 3.13%~70.00% in five essential amino acids for humans, including Leu, Val, Lys, Ile, and Met. Moreover, CPPs
could alter the diversity of the rhizosphere soil bacterial community, and some bacteria, including Bradyrhizobium, Bryobacter,
Candidatus_Solibacter, Gemmatimonas, and Haliangium, which are involved in soil carbon and nitrogen metabolism, were
significantly enriched. CPPs can regulate rhizosphere soil microbial communities, reduce chemical fertilizer application, and
improve the grain quality of wheat “Zhengmai 9023”, resulting in its important agricultural application potential for green
wheat production.
Keywords: Calcium polypeptides; wheat; reduction in chemical fertilizer application; wheat quality; rhizosphere soil microbial
community.
Xiaowen Sun, Xinmeng Jin, Xue Xu. (2022) Effects of calcium polypeptides on wheat yield, grain quality and rhizosphere soil microbial community, Pakistan Journal of Agricultural Sciences, Volume 59, Issue 3.
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