A review of phosphorus nutrition in irrigated cotton farming systems of Australia  

作　　者：NACHIMUTHU Gunasekhar SCHWENKE Graeme MERCER Clarence BISCHOF Callum HULME Pat BELL Michael 

机构地区：[1]New South Wales Department of Primary Industries,Australian Cotton Research Institute,Narrabri,NSW 2390,Australia [2]New South Wales Department of Primary Industries,Tamworth Agricultural Institute,Calala,NSW 2340,Australia [3]The School of Agriculture and Food Sciences,The University of Queensland,Gatton,QLD 4343,Australia [4]Sustainable Soil Management,Warren,NSW 2824,Australia

出　　处：《Journal of Cotton Research》2022年第1期72-79,共8页棉花研究（英文）

基　　金：supported by funding from the Australian Government Department of Agriculture,Water and the Environment as a part of its Rural R&D for Profit program;the Cotton Research and Development Corporation through the “More profit from nitrogen:enhancing the nutrient use e ciency of intensive cropping and pasture systems” project.

摘　　要：Australian cotton production predominantly occurs on Vertisols.The average lint yield of cotton grown in Australia is 2260–2700 kg·hm^(−2),which is 2.5 to 3 times the world average.This high productivity per unit of land area requires efficient use of resources such as water and nutrients.However,high yields accelerate the export of nutrients such as phosphorus(P)in seed,depleting the soil reserves of P more than in other countries with lower cotton yields.Recent surveys of cotton industry indicate that P application rates should match seed P export(30~40 kg·hm−2),but historical depletion within subsoil is still evident and is continuing.Depletion of soil P is typically more pronounced in the subsoil than in the topsoil(0~20 cm)where P fertiliser is applied,as cotton roots rely on these layers as important sources of plant available water and available P.This mismatch between zones of P uptake and resupply may increase stratification of available P in the soil profile.Recent studies showed that cotton responded poorly to banded applications of fertiliser P,while dispersal of fertiliser throughout the plant beds was more successful.Researchers have also observed sporadic cotton responses to applied P fertiliser in soils where available P concentrations were well above the previously determined critical concentrations indicative of fertiliser P responses in Australia.To sustain highyielding cotton production in Australia,a greater understanding of cotton root acquisition of applied P,as well as a re-examination of critical soil P concentrations for each production region are required.

关 键 词：VERTISOL P stratification Soil test critical value 

分 类 号：S562[农业科学—作物学]