Maturing cotton should be the proper use of ethylene ripening

Cotton in the country north and south , generally spring cotton in late August to early September into boll maturity. This year's cotton production , due to the low temperature, rain and other weather effects , resulting in a large area of ​​cotton planting seedling late spring , budding , flowering perennial postponement than 7 to 10 days , is expected to cotton boll maturity will be delayed more than a week . Coupled with an increased proportion intercropping cotton , cotton intercropping most easily greedy green late . Therefore, this year cotton late management , promoting premature measures is particularly important.

Years of practice shows that the proper use of ethylene ripening late-maturing cotton , is a simple, increase production for good measure . After spraying ethephon to early cotton boll opening 7 to 10 days , before frost rate increased by 10 % to 20% , an increase of 6.4% ~ 10.2% , increase from 30 to 50 yuan per mu . And ripening of cotton , but also help Xiacha crops such as wheat sowing and increase the yield . But Ethephon is a " double-edged sword ", if used improperly, not only can not increase production, they cause reduced production and yields . Therefore , we must master the use of technology ethephon , so proper use , in order to achieve the desired results.

Correct choice of farm sprayers spraying cotton . To select the greedy green late -and post -onset strong cotton , mainly cotton intercropping , after the onset of summer sowing cotton and intensity of hybridization cotton. If you choose more than 80% of the boll boll stage in the cotton fields of 40 to 45 days , the effect will be particularly good spraying . For the development of normal mature cotton , especially those with premature aging trend cotton , not spraying ethephon, otherwise it will cause premature cotton blight caused by reduced production and yields decline . For breeding cotton fields , shall not be sprayed with ethephon, if spraying , seed maturity will lead to decreased germination germination rate decreased.

Correctly grasp the suitability of spraying period. How effective spraying ethephon , closely related to temperature . Because ethephon temperature must be higher than 20 ℃ or more to decompose releasing vinyl , so after spraying cotton , requiring daily maximum temperature above 20 ℃ need about 15 days to receive a good spraying results. According to this principle requires , in northern cotton spraying time , should be in the 20 days before frost withered ; cotton-growing areas in the south of the plastic sprayer spraying time , mainly based on the subject boll boll stage and pull stalk deadline , usually before pulling stalk 15 to 20 days is appropriate. Concrete spraying time , the need to utilize local conditions . In normal years , China's Huang-Huai Region , should be in the Oct. 5 after spraying ; Yangtze River valley , in the October 15 to 20, spraying is more appropriate.