Abstract:
【Objective】 To compare the effects of top sealing soil and side sealing soil under dry sowing and wet emergence conditions and to clarify the dry sowing and wet emergence soil sealing approaches which will be suitable for soil types and light and heat conditions in Aksu area.
【Methods】 A completely randomized experimental design was used to explore the effects of different soil sealing approaches on soil temperature and humidity, the seedling emergence rate, dry matter weight per plant of above-ground parts, plant height, main stem diameter, spatial distribution of soil total salt, yield and components under dry sowing and wet emergence conditions that were divided into top sealing soil and side sealing soil. Meanwhile, fuzzy comprehensive evaluation method based on variation coefficient weight was used to evaluate the 11 characters of different ways of sealing soil.
【Results】 Compared with the side sealing soil, the soil daily average temperature of the top sealing soil in the seedling stage was 1.2℃ higher, the soil daily average humidity was maintained at 100%, the seedling emergence rate was 13.7% higher, and the dry matter weight per plant of above-ground parts, plant height and main stem diameter increased, the yield of seed cotton per 667 m
2 was 15.4 kg higher, the bolls number per plant was 1.58 more, the boll weight was 0.1g lighter, and the lint percentage was not much different. However, there was no significant difference in yield and yield components; The soil desalination rates of the top sealing soil in 0-10 cm and 10-20 cm of seed hole were 6.2% and 6.8% lower respectively than the side sealing soil. The soil total salt content of top sealing soil and side sealing soil in 0-10 cm and 10-20 cm showed narrow row (under drip belt) < seed hole < wide row
Y=117.035 6X0.389 8,Y=282.631 4X-0.852 1 respectively. The comprehensive performance of top sealing soil was better than that of side sealing soil in soil temperature and humidity, the seedling emergence rate, desalination rate, main agronomic traits of cotton plants at seedling stage, yield and yield components 11 traits. 【Conclusion】 If the soil texture is clay in cotton field, under the condition of dry sowing and wet emergence, it is suitable to use top sealing soil.