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One-time fertilization at first flowering improves lint yield and dry matter partitioning in late planted short-season cotton
LUO Hong-hai, WANG Qiang, ZHANG Jie-kun, WANG Lei-shan, LI Ya-bing, YANG Guo-zheng
Journal of Integrative Agriculture    2020, 19 (2): 509-517.   DOI: 10.1016/S2095-3119(19)62623-7
摘要132)      PDF    收藏
Cotton producers have substantially reduced their inputs (labor, nutrients, and management) mainly by adopting a short-season cropping management that is characterized by late sowing, high density, and reduced fertilization with one-time application at the first bloom stage without lint yield reduction.  However, it has been hypothesized that one-time fertilization at an earlier growth stage could be a more effective and economic management practice.  A two-year field experiment was conducted by applying five fertilizer one-time fertilization at 0 (FT1), 5 (FT2), 10 (FT3), 15 (FT4), and 20 (FT5) days after the first flower appeared in the field and one three-split fertilizer application taken as the conventional control (FT6), making six treatments altogether.  Cotton growth period, biomass accumulation, yield, and its formation were quantified.  The results showed that the one-time fertilization did not affect the cotton growth progress as compared to FT6, however, the total crop cycles for FT3–FT5 were 3 days shorter.  FT1 produced the highest cotton lint yield (1 396 kg ha–1), which was similar to the FT6 but higher than the other treatments, and could be attributed to more bolls per unit area and higher lint percentage. Cotton yield was positively correlated with cotton plant biomass accumulated.  FT1 had both the highest average (VT) (193.7 kg ha–1 d–1) and the highest maximum (VM) (220.9 kg ha–1 d–1) rates during the fast biomass accumulation period.  These results suggest that one-time fertilizer application at the first flower stage might be an adjustment that is more effective than at first bloom, and allowed for easier decision making for application date due to non counting of plants with flowers is needed.
 
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2. Effects of Plant Density on Yield and Canopy Micro Environment in Hybrid Cotton
YANG Guo-zheng, LUO Xue-jiao, NIE Yi-chun , ZHANG Xian-long
Journal of Integrative Agriculture    2014, 13 (10): 2154-2163.   DOI: 10.1016/S2095-3119(13)60727-3
摘要1311)      PDF    收藏
A rational plant population is an important attribute to high yield of cotton, because it can provide a beneficial micro environment within the canopy for plant growth and development as well as yield formation. A 2-yr field experiment was conducted to determine the optimal plant density based on cotton yield in relation to the canopy micro environment (canopy temperature, relative humidity and light transmittance). Six plant densities (1.2-5.7 plants m-2) were arranged with a completely randomized block design. The highest cotton yield (1 507 kg ha-1) was obtained at 3.0 plants m-2 due to more bolls per unit ground area (79 bolls m-2), while the lowest yield (1 091 kg ha-1) was obtained at 1.2 plants m-2. Under the moderate plant density (3.0 plants m-2), there was a lower mean daily temperature (MDT, 27.1°C) attributing to medium daily minimum temperature (Tmin, 21.9°C) and the lowest daily maximum temperature (Tmax, 35.8°C), a moderate mean canopy light transmittance of 0.51, and lower mean daily relative humidity (MRH) of 79.7% from June to October. The results suggest that 3.0 plants m-2 would be the optimal plant density because it provides a better canopy micro environment.
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3. Fertilizer 15N Accumulation, Recovery and Distribution in Cotton Plant as Affected by N Rate and Split
YANG Guo-zheng, CHU Kun-yan, TANG Hao-yue, NIE Yi-chun , ZHANG Xian-long
Journal of Integrative Agriculture    2013, 12 (6): 999-1007.   DOI: 10.1016/S2095-3119(13)60320-2
摘要1436)      PDF    收藏
N fertilization of 300 kg N ha-1 is normally applied to cotton crops in three splits: pre-plant application (PPA, 30%), first bloom application (FBA, 40%) and peak bloom application (PBA, 30%) in the Yangtze River Valley China. However, low fertilizer N plant recovery (NPR) (30-35%) causes problems such as cotton yield stagnation even in higher N rate, low profit margin of cotton production and fertilizer release to the environment. Therefore, it is questioned: Are these three splits the same significance to cotton N uptake and distribution? An outdoor pot trial was conducted with five N rates and 15N labeled urea to determine the recovery and distribution of 15N from different splits in cotton (Gossypium hirsutum L. cv. Huazamian H318) plant. The results showed that, cotton plant absorbed fertilizer 15N during the whole growing period, the majority during flowering for 18-20 d regardless of N rates (150-600 kg ha-1). Fertilizer 15N proportion to the total N accumulated in cotton plant increased with N rates, and it was the highest in reproductive organs (88% averaged across N rates) among all the plant parts. FBA had the highest NPR (70%), the lowest fertilizer N lose (FNL, 19%), and the highest contribution to the fertilizer 15N proportion to the total N (46%) in cotton plant, whereas PPA had the reverse effect. It suggests that FBA should be the most important split for N absorption and yield formation comparatively and allocating more fertilizer N for late application from PPA should improve the benefit from fertilizer.
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