Effect Of Water-fertilizer-air-heat Coupling Of Living Reclaimed Water On Photosynthesis,yield,quality And Heavy Metals Of Spring Wheat

This paper addresses the safety of white and black wheat irrigated by living reclaimed water in Ningxia.In Xuanhe Village,Xuanhe Town,Shapotou District,Zhongwei City,the effects of living reclaimed water irrigation conditions,water-fertilizer coupling and water-fertilizer-air-heat coupling on the growth,physiology,yield,quality and heavy metals of white and black wheat were systematically studied using potted orthogonal tests,potted comparison experiments and field comparison experiments,and the results can provide a theoretical basis for Ningxia living reclaimed water The results can provide theoretical basis and technical support for the safe and efficient sustainable use of reclaimed water and crop quality and efficiency in Ningxia.The main research results are as follows.(1)The effects of coupled water-fertilizer-air-thermal irrigation with reclaimed water in arid areas on photosynthesis,yield,quality,heavy metals and soil heavy metals of black wheat and the safe irrigation scheme of coupled water-fertilizer-air-thermal irrigation with reclaimed water in arid areas were revealed.The optimal combination of irrigation quota 2250m3/hm2,N application 171kg/hm2 and phosphorus application 172.5kg/hm2,shallow pine and no mulching was determined,and the yield of black wheat was 8310kg/hm2.The content of heavy metals in soil is much less than the National Standard for Food Safety and the Standard for Soil Contamination Risk Control on Agricultural Land.(2)The influence patterns of domestic reclaimed water quality and irrigation quota on the physiology,yield,quality,heavy metals and soil heavy metals of white wheat in arid areas and the safe irrigation scheme of domestic reclaimed water were revealed.The yield of reclaimed water increased by 10.21%and 27.40%than mixed irrigation and tap water irrigation treatments,respectively.The better combination was determined as Q3W3,i.e.irrigation water quality was reclaimed water and irrigation quota was 2250 m3/hm2,when the indicators of white wheat were better and the yield was 8247 kg/hm2,and the content of white wheat seeds and soil heavy metals was much less than the National Standard for Food Safety and the Standard for Soil Contamination Risk Control on Agricultural Land.(3)The influence laws of different irrigation quotas and fertility combinations on the physiology,yield,quality,heavy metals and soil heavy metals of different varieties of spring wheat drip irrigated with living reclaimed water and the safe irrigation and fertilization scheme of living reclaimed water were revealed.White wheat yielded 6.47%more than black wheat.The better treatment was determined to be T3(white wheat W1F2),i.e.wheat variety was white wheat,irrigation quota was 1125 m3/hm2,and soil fertility was high level,at which time wheat indicators were better,yield was 6445 kg/hm2,and wheat seed and soil heavy metal content was much less than the National Standard for Food Safety and the Standard for Soil Contamination Risk Control on Agricultural Land.