| Cotton production has unique advantages in Xinjiang, because of its unique geographical environmentand light and heat resources. As major cotton-producing region in China, cotton production plays animportant role for the development of the national economy. For a long time, the cotton yield is based onthe high-nitrogen fertilizer inputs, and nitrogen fertilizer inputs mainly rely on urea applied. However,long-term excessive urea applied not only waste resources but also pollute the environment. Biogas slurryis a high quality organic liquid fertilizer, and it was transferred back to agricultural ecosystems as nitrogenfertilizer due to the high ammonium concentrations.This study including pot and field trials used cotton （Gossypium hirsutum L.cv. Xinluzao48） as thematerial to discuss the effect of different treatments under equal nitrogen conditions （except the control） oncotton cultivation. The experiment was conducted with six treatments. T0: control （no N fertilizer）; T1:chemical fertilizer100%; T2: biogas slurry100%; T3:25%of total N from the biogas slurry and remaining75%from urea; T4:50%of total N from the biogas slurry and remaining50%from urea; T5:75%of total Nfrom the biogas slurry and remaining25%from urea. Indicators including growth and development ofcotton, yield and its components, soil nutrients and soil heavy metals were examined, and the main resultsas follows:Both pot and field trial, the cotton growth period variation of the same, but field trial had the longercotton growth period variation than that of pot trial. The treatments of combined application of biogasslurry and chemical fertilizer had longer duration of the blooming period than that of other treatments,laying the foundation for the high yield of cotton. Meanwhile, the treatments of combined application ofbiogas slurry and chemical fertilizer had higher plant height, but there was no significant difference in plantheight. Dry matter accumulation was characterized by "slow-fast–slow", consistent with "S" curve canbe fitted with the Logistic equation. T5had the highest dry matter accumulation. The trend of accumulationof N, P2O5and K2O was litter at the seedling stage, increased rapidly at the bud stage, reached a peak at theblooming stage and a gradually decline at boll opening stage under different treatments in the growthperiod of cotton. Various nutrients mainly accumulated in the reproductive organs at boll opening stage,which N, P2O5and K2O were accounted for74.98%76.34%,64.71%67.55%and65.79%67.74%,respectively. N accumulation in different organs was cottonseed> leaf> fiber> shell> stem; P2O5accumulation was cottonseed> stem> leaf> shell> fiber; K2O accumulation was cottonseed> shell>stem> leaf> fiber. Whether in pot or field trial, T5had the highest lint yield, was22.13g·pot-1and2670.4kg·hm-2, respectively. But there was no difference with T4. T1and T2harvested similar cotton yield. Thetreatments of application biogas slurry reduced the soil pH, and T2had the lowest soil pH. The treatmentsof application biogas slurry increased soil organic matter content in varying degrees, however, T0and T1significantly reduced soil organic matter content, especially for T0. The treatments of application biogasslurry also increased the alkaline N, available P and available K content. In addition, this study showed thatthe tendency of the same heavy metal content in soil was consistent. Biogas slurry application in varyingdegrees increased the content of Cu and Ni in the soil, while reduced the content of Pb, Cd and Cr. But theabove five kinds of heavy metal content were according with the national soil environmental quality. |
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