DOI: 10.3724/SP.J.1006.2016.01506

Acta Agronomica Sinica (作物学报) 2016/42:10 PP.1506-1515

Effect of Drip Irrigation Pattern and Planting Density on Growth and Yield Performance of Cotton in Arid Area

Water shortage is one of the major constraints in cotton (Gossypium hirsutum L.) production in north-western China. A field experiment was conducted using high-yielding cotton cultivars Xinluzao 45, with two drip irrigation patterns including con-ventional drip irrigation (I500) and limited drip irrigation (I425), and three planting densities of 12×104 (D12), 24×104 (D24), 36×104 (D36). Leaf area index (LAI), crop growth rate (CGR), boll growth rate (BGR), net assimilation rate (NAR), yield and irrigation water use efficiency (IWUE) were determined. The results showed that, compared with I500, I425 postponed getting peak LAI and alleviated the leaf senescence after full boll stage, and increased the NAR from full flowering stage to boll opening stage signifi-cantly, which increased IWUE, on the premise of non-significant changes in seed yield. The effects of plant density on growth parameters, dry matter accumulation and yield components depended on irrigation patterns. In the treatment of I500, LAI, CGR, BGR, total dry matter weight (TDW), boll dry matter weight (BDW), boll number per area (BN) and the mass ratio of reproduc-tive organs and vegetative organs were the maximum observed under D24, and the minimum under D12. In the treatment of I425, all of the above parameters significantly increased with increasing planting density, and achieved the maximum under D36. Finally, I425D36 and I500D24 had the highest seed yield resulting from the increase of boll number per area. The seed yield and IWUE had significantly positive correlation with BN and RVR. There was a significantly positive correlation between IWUE and NAR. The reason that I425D36 enhanced the yield is the large crop growth rate, capability of dry matter production, and transportation to suc-cessive dry matter to boll from full flowering stage to full boll stage.

Key words:Cotton,Drip irrigation pattern,Planting density,Growth parameters,Yield

ReleaseDate:2017-01-12 13:30:51

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