Experimental Study On Irrigation Uniformity And Irrigation System Of Drip Irrigation System In Cotton Field

Application of drip irrigation under mulch film in agricultural production promotes water-saving irrigation technology and let itinto the stage of precision irrigation and standardized management.This technology has improved the traditional irrigation methods and the efficiency of irrigation,achieved the purpose of water saving,fertilizer saving and labor saving.In fact,the farmers extent the irrigation time and the amount of irrigation and fertilization because of the backwardmanagement and effect of traditional irrigation.This paper carried out an experiment on drip irrigation under plastic film in Hutubi,explored changes of wetting front with irrigation time under different planting patterns and irrigation uniformity of drip irrigation system and effects of different irrigation frequency on growth and water efficiency of cotton.It also explored effects of different water and fertilizer treatments on growth and yield of cotton,optimized the irrigation uniformity and irrigation system of cotton field drip irrigation system in order to provide reference for the application of drip irrigation under film and cotton production in Hutubi.The main conclusions are as follows:(1)The irrigation time of different planting patterns of cotton is different under the condition of the same layout of pipe network and flow rate of the emitter.It confirmed that the optima irrigation for a film of two tube is 8 hours and a film of there tube is 6 hours in Hutubi County.(2)In the conventional drip irrigation system,the irrigation uniformity can reach more than 80%under the condition that the length of branch pipe was 60m and the laying length was 100m and the operation condition of the system were stable.The irrigation plan has a great influence on irrigation uniformity.It can effectively improve the uniformity of irrigation by using more dry pipe at the same time under the premise of the same number of irrigation district.(3)The effect of irrigation frequency on cotton yield was significantly different under P0.01 level under the same irrigation quota.The study found that increasing irrigation frequency was helpful to increase cotton yield.And the increase of irrigation frequency can improve the productivity of irrigation.The irrigation quota is 4800 m~3/hm~2 and the scheme of irrigation frequency of 12 is reasonable for cotton production under drip irrigation in Hutubi.(4)The effect of different fertilizer amount on yield was significant(P<0.05)while the irrigation quota was 4800 m~3/hm~2.This paper suggested that the irrigation quota was 4800m~3/hm~2 and the amount of fertilizer N3:652 kg/hm~2(urea 300 kg/hm~2,amine 234.67 kg/hm~2,potassium sulfate 117.33kg/hm~2)of cotton under film drip irrigation in Hutubi.