| Analysis is made of research stages,technical innovation,application status,technology assessment and potential development of whole plastic-film mulching on double ridges and planting in catchment furrows in the dry land.The results showed that the techniques which integrated film covering,evaporation suppression,runoff catching on ridge surface and rainwater enrichment together increased remarkably field rainfall storage,utilizing rate and corn water use efficiency. Compared with the conventional film mulching cultivation(half flat mulching before sowing),whole film mulching on double ridges in autumn and early spring increased soil water storage below 1m layer by 50.2 mm and 31.7 mm respectively.Meanwhile,the techniques led the highest field rainfall use rate up to 75.2% with an average of 70.0%,corn water use efficiency up to 37.80 kg/(mm·hm2) with an average of 33.00 kg/(mm·hm2),which broke the bottleneck of autumn crops like maize being not sowed and emerged due to spring drought in loess plateau arid area,and increased yield significantly with an average of 8374.5 kg/hm2 by 37.1%,and made a key breakthrough for highly efficient rainwater utilizing techniques in dry land.As a great innovative technology in dryland farming,it had great development prospects by providing technical support not only for Gansu,but also for similar areas at home and abroad. |