描述:
ium between the grain production
and water resource: the drought and the irrigation area in northeast china, the drought and the
irrigation region in Huanghuaihai area, the drought and the irrigation area in northwest
china.The article analized the characteristic of water using of the main crops and the main
cropping systems, compared the economic benefit of the water-saving planting patterns,
studied the economic benefit, the water-saving benefit and participatory farmers survey
results etc. of the water-saving technologies.
描述:
teau the seeding season is cold and little
rainfall. Soil temperature,moisture and fertilizer is an important factor in crop yield. So in this
area dissemination conservation tillage of importance. Most of former researches in
comparison between conservation tillage and conventional tillage. This experimentation
compare with sereval conservation tillage's difference. Through this comparison, wind-water
erosion in the Loess Plateau ecologically fragile areas and application of a reasonable choice
of different measures to provide a reference of farming with a view to achieving the
sustainable and health development of agriculture. In this study, selection of test sites in the
Loess Plateau in northern China typical wind-water erosion area Shenmu, a no-tillage, straw
mulch, plastic film mulching, mulching ridge, ridge of the five kinds of different measures of
conservation tillage experiment, observe ground temperature,soil nutrients,soil moisture,yeild
and soil and water loss.
描述:
eat attention to adopting
various techniques to improve soil quality when plowing the soil, so that the soil could keep
sustainable fertility and high rate of yield.
描述:
e distinctive features in Western and Eastern of
Qinghai's natural disaster in history which based on the historical materials and studied the
Interaction Relationship Between the natural disasters and social-economic development, we
used the theory and analysis method from the research area of disaster history and agricultural
history, try to have a comprehensive investigation between the natural disasters and
social-economic development in the history of Qinghai.
Firstly, we divided Qinghai into two parts: the eastern and the western, under the study of
the geographical features of Qinghai. We summarized the natural disaster of the eastern part
mainly as flood, drought, hailstone and frost with distinctive features of variety, continuity
and growth accompany while the western is mainly as earthquake and snow disaster with
distinctive features of unexpected and severity.
Secondly
,
as the great influence on agriculture and the resulting changement in
agriculture is most profound, so the progress in agriculture sciences is related to withstand the
natural disaster in some ways. The paper discussed the natural disasters affected Qinghai's
agriculture in history, from the aspect of seed selection
、
production
、
processing and storage
to invest the development of mitigation techniques in this area. And for the livestock we
investigated in two sides bred of livestock and prevention of livestock, furthermore we
invested the mitigation techniques which full of geographical characteristics.
Thirdly, the article investigated the relationship between natural disasters and the
economic fluctuation in Qinghai from the perspective of the change in population and grain
price. And then, we analyzed the influence on regional industrial structure from the aspect of
expansion in rural areas, the relationship between agriculture and animal husbandry,
disaster-relief crop introduction and the structure of animal species. In the view of pastoral
economic exchange, we studied the interaction relationship between the natural disasters and
economic development.
Finally, we studied the interaction relationship between the natural disasters and social
development in Qinghai. What is more, we analyzed the policy which includes grain storage,
relieved and help the people in disaster , reduced taxes to control the disaster in history. We
wish these could be helpful to the prevention and control of natural disasters in Qinghai today.
描述:
society. The central
Shaanxi Province lies in the northwest inner-land, lacking in water resources. Although
there have been major farmland irrigation projects and perfect management system in
the Qin and Han Dynasty, the times of the Sui and Tang Dynasty, the situation of water
depletion could not be changed radically.