Guan'gai paishui xuebao (Oct 2022)

Accumulation and Allocation of Dry Matter in Aboveground Part of Cotton under Mulched Drip Fertigation

  • NING Songrui,
  • YAN An,
  • LIU Weiyang

DOI
https://doi.org/10.13522/j.cnki.ggps.2022143
Journal volume & issue
Vol. 41, no. 10
pp. 10 – 18

Abstract

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【Objective】 Irrigation and fertigation control not only plant growth but also accumulation and partition of dry matters in both above- and below-ground parts. In this paper, we investigated the effect of film-mulched fertigation on accumulation and translocation of dry matter in above-ground part of cotton. 【Method】 The experiment was conducted at a saline-alkali cotton field in Xinjiang. The cotton was top-dressed by N, P2O5 and K2O at different N∶P2O5∶K2O ratios: 0∶0∶0 (CK), 1∶1∶1 (A), 1∶0.25∶1.25 (B), 1∶0.4∶0.27 (C), 1∶0.23∶0.20 (D), 1∶0.34∶0.23 (E), and 1∶0.17∶0 (F). The fertilizers in all treatments were drip-irrigated with the emitter mulched by film. The accumulation and translocation of the dry matter in leaf, stem and bud bell was measured in each treatment, and a dynamic model was proposed to calculate change in the accumulation and translocation. 【Result】 As the cotton grew, the accumulation of dry matter increased first followed by a fall, regardless of the treatments. For individual organs, the dry matter index for the leave increased first followed a decline. In contrast, the index for stem decreased continually, while that for the bud and bell increased monotonically. The dynamic model established based on dry matter accumulation and translocation in each organ measured at different stages matched well with the literature results, with R2 ranging from 0.775 5 to 0.992 8. Compared with CK, the treatment A, B, C, D and E and F increased maximum accumulation rate of the dry matter by 11.21%, 11.32%, 13.22%, 4.22%, 14.30% and 10.05%, respectively, while reduced dry matter accumulation time by 4.98%, 3.09%, 3.66%, 2.07%, 4.97% and 3.85%, respectively. Seed yield and utilization efficiency of fertilizers were closely related to the growth parameters of the dry matter accumulation. 【Conclusion】 Treatment E was optimal for dry material accumulation in the above-ground part and its translocations to different organs of the cotton under film-mulched drip fertigation.

Keywords