Abstract:

Total of six drip-irrigation volumes (m3) per hectare including 2250 m3, 2550 m3, 2850 m3, 3150 m3, 3600 m3 and 4200 m3 were determined for the water physiology study of a new cotton cultivar ‘Jiumian8’ under the 180000~330000 plants per hectare of the cultivating density in the experimental field choiced at Minqin of Gansu Province. After two days of each drip-irrigation, the volume water content (VWC) under the soil layers of 20 cm, 40 cm, 60 cm, 80 cm and 100 cm were measured by the WET-HH2 conductivity meter of the soil water and temperature, respectively. Then established standards mode for local drought habitat under drip irrigation by observing the interval time when soil VWC dropped to 20%. The results showed that the VWC under the soil layers from 20 cm to 60 cm significantly suffered from the soil natural evaporation and the transpiration of cotton plants. The yield of the seed cotton was highest up to 4414.5 kg per hectare under the 3600 m3 of drip-irrigation volumes per hectare, which was the optimal drip-irrigation volume for the special early maturing cotton area in Minqin. In the production of standard drip irrigation mode was: total of 8 times of the drip irrigation in the whole growth stages was from the first time 20, June to the last time 30, August, drip-irrigation 300-525 m3 per hectare and drip-irrigation intervals was 8-15 days at different growth stages.