(3) Strengthen farmland infrastructure and enhance soil drought resistance
Drought and water shortage are the main limiting factors for agricultural
production. At present, the average annual precipitation in arid areas of
China is generally below 300〜400 mm,if natural precipitation is stored to
the maximum extent and soil moisture is effectively preserved,which is also
an effective measure to prevent drought.In addition, the cultivation of
fertility can promote the development of crop roots and increase the ability
of "roots searching for water", so as to achieve the drought-resistant effect
of "fertilizer regulating water".
(4) Improving the utilization rate of water resources
Research and application of modern technology and water-saving measures, such
as artificial rainfall, drip irrigation, plastic film mulching, water
conservation, to achieve water conservation, rational irrigation, scientific
(5) Inhibition of evaporation and transpiration
Steam-inhibiting and drought-resistant chemicals have been widely used at
home and abroad.Pharmaceuticals are agricultural liquid membranes,which principle
is to use organic macromolecule substances to form liquid membranes with the
participation of water and the function of regulating and controlling water
molecule, so as to achieve the goal of absorbing water, holding water,
inhibiting evaporation, reducing transpiration, saving water and effectively
supplying water, improving the moisture retention rate and water use efficiency
of precipitation, enhancing the drought resistance of crops under drought stress.
Drought-resistant chemicals include water-retaining agent, drought-resistant
agent and soil structure improver.Water retaining agent is mainly used for seed
coating and seedling root coating; soil structure improver is mainly used for
spraying soil protection after sowing and transplanting.
Drought early warning signals
The drought orange warning signal means that the drought index level is the
third level of drought warning signal, moderate drought, and drought will continue.
Some paddy fields can not maintain water layer; dry land crops have withered;
reservoir water storage has decreased significantly, and water shortage has
occurred in a few water shortage areas.
The red warning signal of drought means that the drought index level is above
grade 4 (including grade 4), and severe drought will continue. Some streams and
fish ponds have dried up, and the water level of small and medium reservoirs is
close to dead storage capacity; a large number of paddy fields have been
cracked, dryland crops have died and lost their income; water shortage has
occurred in cities and towns.
Drought warning signals are divided into two levels, which are orange and red (Table 6-2)
Table 6-2 Classification of drought warning signals