Cotton Biochar Application Impact on the Cotton Growth and Gray Desert Soil Property in Xinjiang

doi:10.7668/hbnxb.201750890

Abstract

Abstract: To explore the effect of the application of cotton biochar on cotton field in grey desert soil in arid area, the effects of application methods of cotton biochar (annual cotton biochar NPKC, constant nitrogen+1.5 cotton biochar NPKBc1.5, low nitrogen+1.5 cotton biochar N_low PKBc1.5, constant nitrogen+3.0 cotton biochar NPKBc3.0, low nitrogen+3.0 cotton biochar N_low PKBc3.0, low nitrogen) on soil physical and chemical properties of desert cotton were analyzed through the design of random field experiment. The results showed that compared with CK, the leaf area of NPKBc1.5 cotton increased significantly, and the number of buds boll increased by 45.67%.The effects of increasing nitrogen application amount and cotton biochar were different, and the cotton biochar was increased to 22.5 t/ha, and the leaf area of a single plant increased by 24.27%.The increase of nitrogen fertilization did not increase the leaf area significantly. Under normal nitrogen application, cotton stalk carbon increased from 22.5 t/ha to 45 t/ha, root canopy ratio increased by 13.3%, leaf area decreased by 11.84%. The number of buds boll increased significantly (P<0.05) while the amount of nitrogen was decreased but the amount of cotton biochar was increased. Soil structure and physical and chemical properties were improved. Compared with CK, when 45 t/ha cotton biochar was applied, the soil pH value dropped to 7.09, down 1.16%.On the basis of N low PKBc1.5 and NPKBc1.5, cotton biochar was increased by 1 times respectively, with natural water content increasing by 1.7 and 0.3 respectively, field water holding capacity increasing by 3.5 and 2.4 respectively, and saturated water content increasing by 6.2 and 1.6, respectively. The content of soil organic carbon reached the maximum value of 17.23 g/kg, an increase of 79.72% compared with the control group. The boll number and leaf area of flower buds and individual plants were significantly affected by organic carbon and bulk density, but not significantly affected (P>0.05). Water content had a positive effect on the number of buds bells. Therefore, it could be concluded that the application of cotton biochar in desert soil could make up for the deficiency of nitrogen and improve the physical and chemical properties of soil.

Key words: Cotton biochar, Leaf area, Leaf area per plant/root-shoot ratio, Gray desert soil property, Root cap equilibrium

CLC Number:

S156.2
S153

FENG Lei, TANG Guangmu, XU Wanli, GENG Zengchao, SUN Ningchuan, LIAO Na. Cotton Biochar Application Impact on the Cotton Growth and Gray Desert Soil Property in Xinjiang[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(1): 188-195. doi: 10.7668/hbnxb.201750890.

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