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Gansu Agricultural University (2018)

Effects of Water Regulation under Subsurface Drip Irrigation on Yield, Quality and Soil Environment of Alfalfa in Desert Irrigation District

马彦麟;

Titre : Effects of Water Regulation under Subsurface Drip Irrigation on Yield, Quality and Soil Environment of Alfalfa in Desert Irrigation District

Auteur : 马彦麟;

Grade : Master’s Theses 2018

Université : Gansu Agricultural University

Résumé partiel
In view of the lack of water resources and water use efficiency(WUE)in desert irrigated areas,such as the low yield and poor quality of the alfalfa and the desertification is becoming more and more serious.This article studied different degrees of water regulation as 35%45%(W0:severe water regulation),45%55%(W1:moderate water regulation),55%65%(W2:light water regulation),65%75%(W3:full irrigation)of field capacity in the alfalfa branching,bud period and full growth period at Gansu Hexi Desert irrigation area with typical desert climate characteristics.The changes of alfalfa plant height,stem diameter and soil moisture as well as nutrients were analyzed under different water control stages at different growth stages.The response of rehydration to drought stress and hay yield as well as quality of the alfalfa to water control during the period of drought stress was explained.The quality,yield,economic benefit,the effect of water regulation,etc.on the performance of alfalfa,based on the multi objective index of water,was analyzed by the grey correlation analysis method.And the key growth period of water control and the gradient of soil moisture control was selected at the same time.The main results show that :(1)The water consumption of alfalfa increased with the increase of irrigation amount,and the soil moisture of alfalfa field tended to decrease with the increase of water regulation.As the depth of soil deepened,it decreased first and then increased,and the soil moisture changes in different soil layers under light water regulation during the whole growth period was not significant.And the soil moisture could be kept within the normal growth range of alfalfa,which was beneficial to the growth of alfalfa and reduced the loss of water ineffective.Soil organic matter,alkali hydrolyzable nitrogen,available P and K decreased with soil depth,and pH had no significant difference.Water content regulation has significant influence on the content of pH,organic matter,alkali hydrolysable nitrogen,available P and K in 040cm soil layers.The content of organic matter and alkali hydrolysable nitrogen is increasing with the reduction of the degree of water regulation,and the content of pH,available P and K is decreasing.(2)The average plant height,stem diameter and hay yield in the growth period decreased with the increase of the cutting times,which showed the second cuttings than the third cuttings higher and increased with the decrease of water control degree.Water stress of different degrees in the branching period showed a certain compensation effect on plant height and stem growth after re-watering in the budding period.The yield of two stubble alfalfa hay was 4589.59 kg·hm-2 and3781.96 kg·hm-2 respectively under the treatment of mild water control at branching stage,and there was no significant difference from CK treatment

Mots clés : Soil water regulation; Alfalfa; Yield; Quality; Water use efficiency; Subsurface drip irrigation; Desert irrigation district;

Présentation (CNKI)

Page publiée le 17 mai 2019