| Cotton is an important cash crop which is an important material in the people's livelihood, it also play an important role in the national economy.The cotton-planting area in Xinjiang is the nation's largest production base and export base of high-quality cotton and commercial cotton,it is also the major shift region of the main national cotton-producing areas.In recent years,with a great change in cotton cultivate system and irrigation system of Xinjiang production and construction corps,as well as promotion of new agricultural technology,the quantity of cotton production increased steadily,there has been a large number of super high-yielding fields≥3000 kg·hm-2 in succession.However,there still have many problems in the cultivation of super-high-yield cotton of Xinjiang,such as the immature technology and poor stability,besides,the key technical have not been breakthroughed either.In order to further research the generational rules and establish cotton cultivation techniques index system of super-high-yield field,we carried on experiments on small plots and investigation on high yield farms to study the photosynthesis,water,nutrition,physiological mechanism,diagnosis index and control technology index of northern cotton,under the control of water and fertilize condition.On the basis of it,we raised the cultivation techniques index of super high-yielding fields which can provide technical basis for accelerating the stability of sustainable development of cotton production in North Xinjiang.The result of research shows that(1) The composition of cotton(hybrid cotton) yield factors in North Xinjing:the plants of harvest plants are 16.5-19.5 ten Thousand per hectare; the boll number is 8-10 per plant;the single boll weight is 5.5-6g;the lint percentage is 43%-45%;the rate of cotton before frost is≥85%.(2)LAI is 4.82-5.30 at the Primary bolling stage,and maintainning 3.5 in latter.(3)The relation of together growth in apparatus that the cotton leaf(n) of main stem about super-high-yield with the first branch-side in the same branch is n+1.5-2.5 leaf age,and with the same place bud is n+0-0.5,its relations are faster than the ordinary high-yield cotton fields.(4)The leaf moisture should be stabilized at 70-80%about super-high-yield cotton;Light interception rate of upper plant part by 50-53%, 40-42%for the lower part;the peak of photosynthesis appears in the full flowering stage,for 34.9-35.8μmol.m-2.s-1.(5)The average soil moisture about super-high-yield cotton from the squaring stage to full opening stage,should be maintained at more than 18%in 0-60cm of soil, the soil moisture of boll flowers stage should be maintained at more than 20%;the soil moisture should be maintained at around 16%from full squaring stage to the later boll opening stage of 20-25 days.The cotton growing is diagnosed through the relativity between rule of cotton leaf occuring and other organs,according to the age of leaf to calculate the time of regulation effect,so that the implementation of the regulation effect in a more accurate time, We can more accurately predict the outcome of regulation.
|
PDF Full Text Request