Experimental Research On Micro-irrigation Technique Of Grown Red Jujube In Arid Area

The weather is very dry and the annual rainfall is less in South XinJiang.Although the light and heat resources are abundant it is one of the producing areas of high-quality red jujube.However,water shortage seriously affect yield and crop planting area of red jujube as a main cash crops.So,It is very important significance to search for a kind of water saving irrigation mode and irrigation system which is suitable for red jujube,also,it can improve the local economy,ecology and social benefit.Micro-irrigation is a water-saving method for low pressure and micro flow directly irrigat to crop root.The paper in the basis of home and abroad successful experience for micro-irrigation technique applied in fruit,We made water consumption characteristics moisture index experiment and various irrigation method contrast test in Aksu area in 2008.And we have been preliminarily obtained preferential suitable water consumption characteristics,optimal irrigation method,scientific and rational irrigation system for grown red jujube.There are some main achievements as follows.(1)The orthogonal test was used three factors of different growth stages and three levels (seventy-five percent,sixty-five percent and fivty-five percent) in different soil moisture floor.And preliminarily determined a suitable soil moisture floor of red jujube in main growth period.In florescence and fruit expanding process which is sixty-five percent of field capacity and in fructescence which is severty-five percent.(2)The grown red jujube water consumption increaseing the soil moisture criteria,the different trends are similar in all treatments.It is less in preanthesis stage in which daily water consumption is four point two to five point two millimeter,in post anthesis stage increase to four point nine to five point seven millimeter,in fruit expanding process it is six to seven point five which is peak value.When soil moisture floor which is seventy-five percent of field capacity,the daily water consumption is great,It is seven point five millimeters,The water consumption is decrease during the period fore-period of fruit mature than fruit expanding process,which is four point six to five point six. Later-period of fruit mature decrease again,which is three point to four point four.When soil water is sufficient,the grown red jujube water consumption are eight hundrd and ninty three point seven millimeters in whole growth period.(3)From the red jujube yield,quality,physiological characters,root distribution and soil moisture, and fuzzy mathematics relative membership degree comprehensive evaluation method analyze,The analysis shows that micro-irrigation is optimum micro-irrigation technique for grown red jujube,then drip irrigation,the poorest is bubble irrigation.When we use micro-irrigation,tri-tube drip irrigation, double-tube drip irrigation compared with surface irrigation,they increase yield over ten percent and reduced irrigation quota over fifty percent,And preliminary determined micro-irrigation suitable wet ratio is fourty percent to seventy percent for grown red jujube,with it,seventy percent for micro sprinkler irrigation,fourty percent to fifty percent for drip irrigation.(4)In whole growth period of red jujube,according the regularity of fruit growth and development characteristics of water requirement and the local rainfall data,determined the irrigation system of red jujube,irrigation quota is two hundreds and eighty eight stere per hectare at florescence and fruit expanding process one hundred and ninty two stere per hectare at fructescence.Irrigation cycle is eight days at fore-florescence reduced to four days at mature period approximately,irrigation times and showed normal distribution in whole growth period of red jujube,When they are ten times it reached the peak at fruit expanding process,At this times the stage quota is two thousands and eight hundreds and fifty stere per hectare.They need thirty five to thirty six times irrigation times and nine thousands and three hundreds and seventy five stere per hectare.for Irrigation quota In whole growth period of red jujube.