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Northwest A&F University (2020)

Impact of Cultivating Green Manure Crops with Reduced Phosphate Fertilizer Application on Wheat Growth and Soil Properties under Dryland Conditions of the Loess Plateau

王安远

Titre : Impact of Cultivating Green Manure Crops with Reduced Phosphate Fertilizer Application on Wheat Growth and Soil Properties under Dryland Conditions of the Loess Plateau

Auteur : 王安远

Grade : Doctoral Dissertation 2020

Université : Northwest A&F University

Résumé partiel
Phosphorus(P) is an essential element for all life forms on Earth.Phosphorus is the most important mineral nutrient after nitrogen(N)in crop production,which requires sufficient phosphorus supply in soil.However,overuse of phosphate fertilizer is common in China’s grain production and other crop systems.Phosphorus mainly exists in inorganic form in calcareous soils in northern China,accounting for about 70-80%of total phosphorus in soils.After phosphorus fertilizer is applied to the soil,most of it is adsorbed and fixed by the soil,converted into slow acting state and accumulated in the soil with high steady-state,forming a huge potential pool of phosphorus,and how to reuse it is a difficult problem.The Loess Plateau is an important crop producing area in China,and winter wheat-summer fallow is one of the main cropping systems in this area.In the process of winter wheat planting,the excessive application of phosphorus fertilizer gradually increased.Cultivating green manure crops in summer fallow can increase soil fertility and improve rainfall utilization efficiency,which is one of the effective measures to develop sustainable agriculture.However,can cultivating green manures,affect soil chemical properties,activate soil insoluble phosphorus,increase soil available phosphorus content,promote winter wheat phosphorus absorption,reduce the amount of fertilizer phosphorus application ?Such studies are rarely reported in under semiarid climatic conditions of Weibei dryland of the Loess plateau.A 3-years split plot experiment was conducted at the aims of evaluating the effects of different summer green manure crops and P fertilizer rates on the soil P availability,soil chemical properties including soil organic matter,residual NO3-storage,total N content,also to figure out how these crops can reduce the high application of P fertilizer for subsequent crops and can affect the wheat growth in the Weibei dryland of the Loess plateau.The main plots consisted of three GM crops(black bean,rapeseed,and summer fallow as control)and 5 sub-treatments(synthetic P rates of 0,40,80,120,and 160 kg P2O5ha-1 applied at wheat sowing).Three treatments(black bean,rapeseed at 80 kg P2O5ha-1and fallow at 120 kg P2O5ha-1)were also chosen in this study to refine the results.The main research results were listed below:1)The wheat yield,biomass,yield components(1000 kernel weight,number of spikes,harvest index),P uptake,Partial factor productivity(PFP)in the GM treatments refining the data for three treatments with 80 kg P2O5 ha-1 rate were similar with those in the fallow treatment with 120 P2O5 ha-1 rate during the test 3 years.Green manures were not able to increase the wheat N and K content as compared to fallow.GM biomass&P accumulation were higher in black bean as compared to rapeseed.For two years 2018-2019,rapeseed and black bean increased the soil organic matter content by 5.7%,4.9%and 6.3%,5.6%in upper 0-10 cm depth as compared to the fallow

Mots clés : Green manure crops ;Phosphate fertilizer ;Winter wheat ;Phosphorus fraction ;Liquid 31P NMR ;Loess plateau ;

Présentation (CNKI)

Page publiée le 21 octobre 2021