PJB-2018-287
OPTIMIZING PHOSPHORUS FERTILIZATION PROMOTES DRY MATTER ACCUMULATION AND PARTITIONING IN COTTON (Gossypium hirsutum L.) UNDER MULCHED DRIP IRRIGATION
BOLANG CHEN
Abstract
Crop yield improvement was associated with dry matter accumulation and partitioning, especially photo-assimilates translocating from source to sink. Improving nutrient management is critical to promote translocation of photo-assimilate to sink and increase crop yield. This study was performed to evaluate how dry matter accumulation and partitioning in three cotton cultivars are affected by the P fertilization rates (0, 75, 150, and 400 kg P2O5 hm-2) and P fertilization sources (Diammonium phosphate (DAP) and Triple Superphosphate (TSP)) under mulched drip irrigated conditions. Results showed that maximum total dry weight (DW) was obtained at 150 days after planting (DAP) because of reproductive organs inflated in maturity. Cultivars differed significantly among themselves in the production of total DW and its partitioning between different organs. P fertilization greatly increased the dry matter accumulation and partitioning of three cotton cultivars. Optimum P rate (150 kg P2O5 hm-2) allocated 45.7% and 51.7% more dry matter into reproductive organs in bolling stage(120 DAP) and in mature stage(150 DAP), respectively. The P fertilization sources produced a little effect on the allocation of DW in various parts of the plant. There were positive significant correlations (0.79, 0.50, and 0.99) between seed cotton yield and total DW, vegetative DW, and reproductive DW, respectively.
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