In Vietnam, the corn area in 2010 reached more than 1.1 million ha , the average yield of 41 kg / ha , the total output of 4.6 million tons of corn hybrids with more than 90 % .
However, this yield is still lower than the average yield of the world ( 51.6 kg / ha ) , China ( 55.5 kg / ha ) and lags far behind the United States ( 96.5 tons / ha ) . The fact is that every year Vietnam still has to import more than 1 million tonnes of maize ( mostly GMOs ) as food for cattle .

 Demand for corn for livestock growing up , so the forecast of agricultural products will still increase . Northwest is one of the capitals of important corn trendline of Vietnam with an area of ​​about 214.000ha . Northwest Land 's pretty consistent with this crop . In the context of rising agricultural prices have rocketed in the Northwest that corn in recent years grew very hot . Corn headline ran up the hill , top of the mountain . Corn shaved virgin forests and secondary . Corn beef up the slope incredible , over 25 degrees .

Cultivation in steep slopes , weather dependent countries , not only made ​​less intensive corn yield average of just Meng Meng northwest around 37 kg / ha , but also makes the environment of the affected areas , land washed with super fast speed . In addition farmers here also have a habit after each harvest , burning corn stalks on the hill makes vegetation destroyed , making the soil more washed out , faded quickly .

Many plans , if any still way corn today , ten years from Son La - an area where most of the major corn Northwest also had little arable land to be this species . The production , storage situation , maize processing in the Northwest is even more difficult . There is not a factory -scale animal feed that is mostly corn drying and shipping retail craft market on the plains .

The rate of loss with cheap price makes it that farmers always unsteady , like corn on the steep sections . That's why the Center National Agricultural Extension recently held Forum @ Agricultural Extension : " Links in four maize production sustainable Northwest " with the aim of finding a real solution good long term potential for this species .

English is linking the four workshops , but almost only found in the forum but scientists state role , entrepreneurs ( like it is now , but consumption is not processed ) very faint . Therefore structured around workshops mainly discuss measures maize cultivation on slopes , not up to the level of the four links in the production . For the mountains , the production level is limited , so choose farming methods which have simple , efficient sustainable with the environment is not easy .

Maize fields are covered with organic body of scientists said would limit soil erosion . Materials to be covered with the remnants of the previous season 's crop or wild plant leaves , discarded agricultural products . Measures maize fields are covered with organic body wash is not only limited but increasing humus , good moisture , high productivity .

Preventing soil erosion on sloping land cultivation , the group of scientists from the Institute of Agriculture and Forestry Science and Technology northern mountains have tested methods to create small terraces on steep ground from 20-25 degrees combined then cover corn . The results show that this measure has limited arable land erosion huge . Each year, only 0.53 tonnes / ha leaching , which decreased to 84.5 % compared to conventional style .

These measures also help increase income by reducing land preparation , weeding, increase the productivity of maize . In addition, to reduce soil runoff , which can carry out measures of maize intercropped with beans or peanut wild cats . To minimize nutrient competition with corn , leguminous crops should be sown after maize was 50 days old size .

When harvesting corn and beans is retained to cover the land , planting seed for the next crop . A scientific process is for minimum tillage in autumn and winter on the slopes . Clean grass cultivation before sowing . Sowing focuses on a seasonal pests to avoid the waves . Corn ( if possible) with other crops to avoid pest buildup . Maize intercropped with legumes . Chemicals used in only necessary conditions ...

Source: http://nongnghiep.vn