With population increasing and arable land decreasing, high productivity of arable land is demanded. However, the shortage of water resources is the limited factor, especially in Northchina. Water - saving agriculture is very necessary for sustainable development in this area. The wheat root goes down till 2 meter deep in loam soil. The 2 - meter soil layer is a big water reservoir and the water in 100 - 200cm soil is very important for the water supplement in the later growing stages. Decreasing irrigation...
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