滴施缩节胺与氮肥对棉花生长发育及产量的影响

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<p id="C3">In order to explore the effects of DPC (1,1-dimethyl-piperidinium chloride) and nitrogen fertilizer on agronomic traits and clarify the interaction effect of DPC and nitrogen fertilizer through drip irrigation in cotton, we performed a two-factor randomized block design with three nitrogen levels (pure N, N1: 150 kg hm ^-2, N2: 300 kg hm ^-2, and N3: 450 kg hm ^-2) and three DPC levels (D1: 525 g hm ^-2, D2: 1050 g hm ^-2, and D3: 2100 g hm ^-2). These groups interacted with each other and formed nine treatments. The effects of different groups on agronomic traits, the spatial and temporal distribution of boll, the accumulation and distribution of dry matter, yield, and fiber quality were investigated in cotton. The results showed that the interaction between DPC and nitrogen fertilizer had a significant impact on the agronomic traits of cotton; The retarding effect of DPC on cotton growth was weakened or even disappeared under the low nitrogen condition. Under N1 treatment, compared to D1 treatment, plant height, initial node height of fruit branch, length of fourth, and seventh fruit branch of D3 treatment increased by 12.07, 1.54, 1.28, and 1.20 cm, respectively. Under normal or high nitrogen conditions, DPC had a certain retarded effect on cotton growth, but the control effect did not increase with the increasing DPC doses. Under N3 treatment, compared with D1 treatment, the plant height, first fruit branch length, and the average internode length of the second fruit of D3 treatment decreased by 1.05, 1.68, and 1.52 cm, respectively. Plant height, stem diameter, and fruit branch number of cottons increased with the increase of nitrogen application rate. Compared with N1 treatment, N3 treatment increased 3.30 cm, 0.75 mm and 0.29 sets, respectively. There were no significant differences in the length of fruit branch and internode among the different nitrogen application rates. The drip application of D2 treatment was beneficial for dry matter accumulation and translocation to reproductive organs. It promoted pre-ambient and ambient peaches growth, but there was not significant effect on cotton yield and fiber quality. The total dry matter accumulation was 13.14%-44.50% higher in N1 than that in other treatments. The percentage of reproductive organs increased by 2.05%-6.30% compared with N3 treatment. When applying 2100 g hm ^-2 DPC and 150 kg hm ^-2 nitrogen fertilizer with water drop, the cotton fiber quality, seed cotton yield, boll number per plant, and boll weight per plant were the highest; and the effect of yield increase was better. In conclusion, we recommended to apply 1050-2100 g hm ^-2DPC and 150 kg hm ^-2 nitrogen fertilizer with drip irrigation in the cotton area of northern Xinjiang.