Study On The Relationship Between Annual Root Growth Changes And Aboveground Growth And Fruit Of Alar Jun Zao And Hui Zao

The growth of roots and aboveground parts affect and relate to each other.In the past of the growth peak of roots,the growth peak of branches appears.On the contrary,if the branches grow slowly,the growth peak of roots appears,and the two alternate with each other.Taking 10-year-old Jun jujube and grey jujube trees as experimental materials,this paper studies the growth relationship between the root system of Jun jujube and grey jujube and the aboveground branches and other organs and environment,uses the plant root monitoring system to monitor the dynamic growth of the root system,and studies the relationship between the growth indexes of aboveground branches,flowers and fruits and the root growth,the overlapping period and alternating period of growth,Explore the competitive nutrition relationship between underground and aboveground.The purpose is to further grasp the interaction between soil,root system and aboveground,scientifically and effectively cultivate,fertilize and irrigate,improve land economic benefits and increase production and income.(1)The three soil layers of horizontal root and vertical root showed regular changes.The first growth peak of horizontal root was at the end of June,the second small peak was in mid-late August,the third peak was at the end of September,and the rapid decline gradually stopped in mid-October.The vertical roots also had three growth peaks from April 11 to November 7.The root growth was the largest in the 60-80 cm soil layer of horizontal roots,and the largest in the 20-40 cm soil layer of vertical roots.The number of absorbing roots and conducting roots grew the most in June,which was the period of rapid growth of the first branch,the second branch,the jujube hanging and the flower organ of the aboveground.(2)The growth trends of horizontal root and vertical root layers were similar.The first and second growth peaks of horizontal root layers were in mid-late June and mid-August,respectively,while the third growth peak was in mid-October,half a month later than that of Junzao.The first growth peak was on May23,one week later than junzao,and the second peak was on June 20.After the third peak at the end of September,there was a slight decline,and then there was another peak at the end of October.After that,the vertical root system entered the period of overwintering dormancy and gradually stopped growing.The root length growth was the largest in the 60-80 cm soil layer,and a large number of harvesting and conducting roots were formed from May to August,which was longer than that of absorbing and conducting roots in Junzao.(3)The first and second growth peaks of horizontal roots were 1-2 weeks earlier than junzao,and the third growth peak was 15 days later than Junzao.The first growth peak of vertical root system of Junzao was earlier than that of Huizao,the second peak and the third peak were almost the same as that of Huizao,but huizao had four peaks,and the growth of vertical root system of Huizao was higher than that of Junzao.From the beginning of September to the beginning of November,the vertical root growth of Jujube jujube was active,while the trend of Junzao jujube was slow.The first branch length of Junzao and Huizao had only one large growth period,the first branch thickness of Junzao had three large growth periods,and the first branch thickness of Huizao had only two growth periods.Both length growth and coarseness growth showed a "slow-fast-slow" trend.The first branch length of Jujube jujube was two weeks later than that of Jujube jujube.The peak of secondary branch elongation was one week later than junzao.The relationship between soil temperature and air temperature was significant.The flowering number of Jujube jujube was positively correlated with soil temperature and air temperature.Jujube hanging and new shoot growth period than junzao 20 days later,jujube hanging per jujube stem number and jujube hanging length are greater than Junzao,but jujube hanging flowers less than junzao,so less fruit set.In the middle of June,the root system grows slowly,which is the most vigorous time of flowering.From mid-August to mid-September,the fruit grows rapidly,and the root system also grows,but the growth peak is low.In mid and late October,the growth of overshoot stopped completely and entered the deciduous stage.It can be seen that roots grow alternately with shoot,flowering and fruit growth.Shoot organs supply nutrients for the peak period of root growth,and abundant roots provide nutrients for shoot,flower and fruit growth.(4)The root growth is closely related to soil temperature.When the soil temperature reaches 21℃ in spring,the root growth begins to enter a peak.The root growth of junzao and Huizao in different depth soil layers showed that the root growth was active in the soil layers of 20-40 cm and 60-80 cm,and the annual total growth was large,so the fertilizer and water management in this area could be increased.