| Study on soil water effects of the techniques of whole plastic-film mulching on double ridges and planting in catchment furrows of dryland corn |
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| DOI：10.7606/j.issn.1000-7601.2008.06.04 |
| Key Words: dryland corn whole plastic-film mulching double ridges rainwater harvesting planting in catchment furrows soil water |
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| Abstract: |
| Field plot experiments were employed to investigate soil water effects ofr the techniques of whole plastic-film mulching on double ridges and planting in catchment furrows of dryland corn under different film mulching modes．The results showed that compared with the conventional film mulching cultivation （half flat mulching before sowing） autumn double ridges whole mulching early spring double ridges whole mulching and sowing double ridges whole mulching increased water content of 0～20 cm soil layer by 5．6～6．2％ 3．9～5．2％ and 0％～4．0％ respectively；increased water storage of1m soil layer by49．5～51．3 mm 33．9～39．6 mm and 0～26．9 mm respectively before corn shooting which indicated it was the relative higher soil water content of autumn whole mulching and early spring whole mulching that solved the major problem that corn could not be sowed and emerged because of spring drought．The techniques increased field rainfall use rate and corn water use efficiency remarkably which lead the highest field rainfall use rate and corn water use efficiency to 75．2％ and 35．93kg／（mm·hm2） respectively and the average field rainfall use rate and corn water use efficiency to 70．1％ and 33．63 kg／（mm·hm2） respectively．It has made a key breakthrough for highly efficient rainwater utilizing techniques in dryland. |