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Ningxia University (2018)

Study on Water Consumption Law of Maize under Different Soil Water Condition in Arid Area of Ningxia

张乐;

Titre : Study on Water Consumption Law of Maize under Different Soil Water Condition in Arid Area of Ningxia

Auteur : 张乐;

Grade : Master’s Theses 2018

Université : Ningxia University

Résumé
Aiming at the problem of poor management of maize and the key parameters of irrigation system are uncertain in arid zone of Ningxia,the five treatments F1(75%θf)、F2(70%θf)、F3(65%θf)、F4(60%θf)、F5(55%θf)were set,the water content change,water consumption rule,growth index,photosynthetic parameters,yield and water use efficiency of maize under different water conditions were compared and analyzed,and the related models of corn yield were established.the main conclusions were drawn :(1)The range of water content in shallow and middle layer was large,but the change in deep layer was slow.The maximum moisture content of treatment F1,F2 were in40-60 cm,and that of treatment F3,F4,F5 were in 40-60 cm.Water consumption and water intensity were decreased with the decrease of the lower limit of soil irrigation.Oscillation-silking stage and jointing stage was the sensitive stage of water demand.The treatment with high lower limit in key growth period has less irrigation quantity and more times.From irrigation to the day before the next irrigation,water consumption tended to decrease slowly.(2)Plant height,plant height,growth rate,stem diameter and leaf area increased with the increase of the lower limit value of soil moisture,and the growth value of middle water treatment was higher than that of low water treatment.In conclusion,high and medium moisture treatment were beneficial to the increment of growth,and during the jointing stage and oscillation-silking stage,they were sensitive period in which the growth rate increased.(3)The diurnal variation of Pn in all treatments was a bimodal convex parabola showed a positive correlation with low irrigation limit.The Tr of high moisture treatment was higher than that of low water treatment.The stomatal conductance of leaves decreased with the decrease of the lower limit of soil moisture.Moderate range of water stress can improve leaf water use efficiency.(4)Different treatments of ear length,ear diameter,hundred-grain weight and grain weight were increased with limit of soil moisture increases,the bald tip length was decreased with limit of irrigation increases.The yield of the treatments(F1、F2.F3)was significantly higher than that of the low water treatment(F4、F5).Treatment F2 has the highest utilization efficiency of irrigation water ;the water use efficiency of treatment F3 was the highest,and F2 was the second.In general,the maximum water use efficiency was concentrated in the middle moisture treatment.(5)The fitting curves of Maize Yield and irrigation amount,water consumption and water use efficiency,water consumption and water use efficiency were all two parabola of open down,The water consumption corresponding to the maximum yield was larger than the water consumption corresponding to the highest water use efficiency.Considering the yield and water use efficiency,the lower limit of irrigation treatment was 70%(Irrigation amount is 7634.5m3/hm2)of the field water holding rate,which was more suitable for irrigation

Mots clés : maize; soil water condition; water consumption law; water using efficiency;

Présentation (CNKI)

Page publiée le 12 mai 2019