agricultural science

Experimental study on cotton picker America began from 1850, but over a period of 100 years of slow progress. In 1949, the mechanization degree of cotton harvest was only 6%. To cultivate suitable for mechanized cotton varieties from 30s onwards, the varieties bred fruit length

Medium, good wind resistance, Miantao not too concentrated, leaves small and thick, thereby speeding up the development of cotton harvest mechanization. At the same time, in the pre harvest application of chemical defoliants, and successfully developed for the complete machine picking cotton scutching equipment. Under the mutual cooperation of these measures, the United States mechanized cotton production in 1970 reached 95%. On the other hand, the United States to improve cotton yield, the narrow spacing and cotton high density cultivation made a lot of research work, but until 1970 before the start of production to adapt to the comb type cotton picker operation of narrow spacing, this kind of cultivation was popularized in large area.

Japan began to develop rice transplanter from late nineteenth Century to 1967, made of hand self-propelled machine transplanter, but because of the complex structure, planting quality is not stable, especially mechanical evulsing failed to solve the problem, to 1970 mechanical planting area accounted for only 3%. 1970 began to implement the centralized method of raising seedling plant, promote seedling with soil cultivation method, Development Zone seedling transplanter, 1984 planting mechanization level reached 95%.

China's Heilongjiang province from 60s to study suitable for the region in the form of small tillage - deep loosening, while the development of deep plowing method for the combination of farming machines, replacement of different parts, can be carried out more than 10 jobs. In 70s after the promotion, crop yield by 10 ~ 12%, root crops increased by 20 ~ 30%; at the same time to reduce the amount of 1/4 on tractors, agricultural investment to reduce fuel consumption reduced 1/3 1/4, cultivated land.

Seed pelleting with the coating material mixed with fertilizers and pesticides to small or irregular shape, is conducive to seed germination and growth of pest control, and easy to achieve precise seeding.

In order to adapt to the mechanization of soybean harvest, people began to cultivate lodging, a small drop new soybean varieties and lower grain pod position high, development of flexible platform ground copying good performance, the combination of the two soybean harvest losses greatly reduced.

If the other is not easy to damage the phloem of tomato, dwarf sorghum and maize lodging and other new cultivars, and grape cultivation wall, have created favorable conditions for mechanized harvesting of these crops.