After the early wheat harvest stubble, can eliminate a lot of the cotton bollworm, cutworms and other pests and weeds, get rid of soil compaction, soil moisture and drought, and promote the benefits of stubble crop growth and development, it is a good measure to serve multiple purposes.
Because the first generation of cotton bollworms mainly harms wheat , 90% of the second generation of cotton bollworms in the main wheat producing areas are from wheat fields. With the continuous improvement of wheat fields of water and fertilizer conditions, and the promotion of high-yielding varieties of wheat, the wheat harvest is constantly delayed, leading to the development of the cotton bollworm in wheat fields increases the age of two, a large number of larvae pupate be buried for the second The cotton bollworms have a large number of insect sources. As of 2011, the wheat harvest of Beijing, Tianjin, Hebei, Shandong, Henan, Jiangsu, Anhui and other provinces and cities, large than the last century was delayed about 7 days nineties. In spring, the spring temperature in many places in China has been low for a long time , and the maturity of wheat has been significantly delayed compared with normal years. Therefore, in a timely manner after the wheat harvest stubble cultivator, not only can greatly reduce the survival rate of first-generation cotton bollworm, effectively reduce insect source base of the second generation cotton bollworm, reducing the harm second-generation cotton bollworm and cutworms and other pests, reducing Prevention and treatment of drugs. Moreover, it can also break the soil compaction, eliminate weeds , protect the drought , and help the seedlings of the squat crops and the growth and development of the intercropped crops . It is a good measure.
According to the author's investigation in Weifang and other places , the pupation rate of the first generation of cotton bollworm in the wheat field increased from 25.7% in the 1990s to 35.3% in 2011 , and the cockroach effect of the early harvesting of wheat after harvesting was about 40% . When summer maize is planted , the water content of 10 cm soil is 21% higher, the corn seedling rate is increased to 13.2%, and the yield is increased by 4.7% . Liaocheng investigation, promptly after wheat harvest stubble, killing effect bollworm insect pupae of more than 30%. In Tianmen City , Hubei Province , the effect of timely cultivating and eliminating cockroaches after harvesting was 30%-44% . Henan Tangyin investigation, occurred in the year of the big cotton bollworm, Helicoverpa armigera larvae before wheat harvest has 7.4 per square meter; through timely stubble wheat harvest, down to 1.7 pupae per square meter, a 77% reduction compared to the previous wheat harvest. Because 80% of the cotton bollworms enter the soil and the depth of the soil is 2.5 cm to 6 cm in the soil layer , only a very small number of intrusive alfalfa is 9 cm deep , so the depth of the cultivating cockroach is 6-7 cm. To do with the wheat harvest with stubble cultivators, and stands shattered Ke La, both to better undermine its pupal chamber, but also conducive to preservation of soil moisture and drought. By cultivating stubble damage pupa chamber, it is exposed Shaisi pupae or bird pecking on the ground, thus effectively reducing the insect second generation, reducing the pressure of the second-generation prevention bollworm, is a environmental protection and efficient for good measure, it is worth actively promoted. ( Jia Dengsan )
Source: Rural Volkswagen
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