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Xinjiang Agricultural University (2010)

Study on Mechanism and Technology of High Efficient Utilization of Phosphorus Resources at Cotton Field in Oasis

Chen Bo Lang

Titre : Study on Mechanism and Technology of High Efficient Utilization of Phosphorus Resources at Cotton Field in Oasis

Auteur : Chen Bo Lang

Grade : Doctoral Dissertation 2010

Université : Xinjiang Agricultural University

Résumé partiel
Xinjiang is part of arid and semi-arid area in China, whose oasis area is 80, 000 square kilometers, 7.8% of the plain area. The oasis is the mainstay of agriculture in Xinjiang, in the supply of consumption resources for above 95% of Xinjiang’s population. In the plantation of the oasis area, cotton cultivation is the major industry, playing a vital role in Xinjiang’s national economy. Now, cotton area is 1,780,000hm2, accounting for 40.6% of the cultivated land area, whose output amount to more or less 50% of the gross value of agricultural output. However, the deficiencies still exist in the efficient management and use of the nutrients in cotton production, which has become one of the limiting factors restricting the development of cotton industry in Xinjiang. In this case, this thesis takes cotton as the target and makes an in-depth research of the soil types, the fertilizer amount and types in different climatic region, and their impacts on soil phosphate efficiency in cotton fields, as well as the utilization efficiency of phosphorus of the different cotton species ; by using field experiment, pot cultivation and indoor analysis. The main results were as follows:1.Study on phosphorus efficiency of cotton field under different soil textures on pot culture Application phosphate could significantly increase available phosphorus content. The increasing rate of available phosphorus was the highest in sandy loam and the lowest in clay, but the content of available phosphorus was the highest in clay and the lowest in sandy loam. The content of available phosphorus at flowering and bolling stage was the highest than other stage under three soil textures. The total phosphorus content of three types of soil texture changed from 0.6g·kg-1 to 1.6g·kg-1. The amount of phosphorus absorption was the highest in clay and the lowest in sandy loam soil. The highest amount of phosphorus absorption come out at growing periods(flowering stage, flowering and bolling stage and bolling stage ) and the partition rate of phosphorus absorption at growing periods in sandy loam cotton field ,in loam cotton field and in clay cotton field were 90.2%、85.7% and 78.8%.The experiment of phosphate adsorption and desorption under different soil textures showed that the order of phosphorus sorption index(PSI),max buffer capacity (MBC) and phosphorus absorption was the highest in clay and the lowest in sandy loam soil, but the order of readily desorbable phosphorus(RDP), phosphorus desorption and phosphorus desorption rate and the standard phosphorus requirement(SPR) was the highest in sandy loam and the lowest in clay soil, The estimated result with Langmuir equation showed that the SPR of sandy loam, loam and clay cotton field were 160.7kgP2O5hm-2, 158.3kgP2O5hm-2 and 125.0kgP2O5hm-2 respectively.2.Effect of applying phosphoric fertilizer on adsorption and desorption action of phosphorus in cotton field soil at different growing stages The adsorption curve of P was identical with the Langmuir equation, Temkin equation and Freundlich equation, and the correlation coefficients of all samples were significant at 0.01 level. Supplying phosphorus increased the degree of P saturation (DPS),equilibrium P concentration at zero sorption (EPS0),phosphorus absorption , phosphorus desorption and phosphorus desorption rate, but supplying phosphorus decreased the standard P requirement(SPR).

Mots clés : Oasis cotton phosphorus high efficient utilization Xinjiang

Présentation (Dissertationtopic)

Page publiée le 5 mai 2013, mise à jour le 4 mai 2018