Effects of Biochar Application before and after Freeze-Thaw on Soil Hydrothermal and Cotton Growth under Drip Irrigation

Biochar as an organic soil conditioner has colossal application potential. Many recent studies revealed the influence of biochar on during crop growth period. However, few considered effect seasonal freeze-thaw biochar’s improvement effect. Therefore, we conducted a field experiment to observe impact and cotton (Gossypium hirsutum L.). We used four rates (0.33%, 0.66%, 1.00%, 1.33% mass fraction) applied in before after freeze-thaw, respectively. The results showed that applying was more effective water storage temperature preservation Moreover, with 0.66% fraction improved biomass by 5.31~36.13%, leaf area index −10.82~32.52%, seed yield 3.88~21.98%. Based principal component analysis fiber quality, found most significantly. In total, at optimal mode for improving hydrothermal conditions, growth, quality. Our study can provide scientific reference northern Xinjiang, China.