减氮配施腐植酸对新疆海岛棉光合特性及产量的影响
周杰闻 , 王亮 , 张娜 , 崔建平 , 林涛 , 田立文 , 汤秋香 , 郭仁松
中国农业大学学报 ›› 2024, Vol. 29 ›› Issue (12) : 254 -265.
减氮配施腐植酸对新疆海岛棉光合特性及产量的影响
Effects of nitrogen reduction combined with humic acid application on photosynthetic characteristics and yield of island cotton in Xinjiang
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为探究减氮配施腐植酸对新疆海岛棉光合特性及产量的影响,以海岛棉‘新78’为试验材料,采用单因素随机区组试验,分别设置不施氮(CK)、常规施氮600 kg/hm2(OF1)、减量施氮300 kg/hm2(OF2)、减量施氮300 kg/hm2 +腐植酸150 kg/hm2(OF3)、施腐植酸300 kg/hm2(OF4)5个处理,分析不同施肥方式对海岛棉叶面积指数(LAI)、光合有效辐射(PAR)截获率和叶片SPAD、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(GS)和胞间CO2浓度(Ci)及产量等指标的影响。结果表明:与CK相比,OF3可显著提高海岛棉的LAI、PAR截获率和叶片SPAD。OF3的LAI在盛铃期达到峰值,比CK、OF2、OF4分别升高7.56%、6.41%、6.37%,与OF1无显著差异(P<0.05)。群体PAR截获率全生育期呈现先上升后降低的趋势,OF3盛铃期在垂直距离70 cm处可达0.9以上,且OF3在盛铃期叶片SPAD分别比CK、OF2、OF4高6.00%、4.77%、3.67%(P<0.05),与OF1无显著差异。减氮配施腐植酸可使光合特性保持较高水平,增加干物质积累量,提高海岛棉产量。整个生育期内,OF1和OF3海岛棉的Pn、GS和Tr均显著高于CK、OF2和OF4,且OF3与OF1无显著差异(P<0.05)。光合参数在盛铃期差异达到最大值,OF1的Pn、GS和Tr分别比OF3高2.62%、1.75%、1.51%,OF1的Ci较OF3降低4.64%。同时,OF3可使海岛棉植株干物质积累比CK、OF1、OF2、OF4提前4~13 d进入快速积累期,海岛棉产量升高6.31%~20.89%,并获得最大的积累速率(1.53 g/d)和生长特征值(60.67),分别比OF1高出25.41%和2.67%。综上,在新疆海岛棉种植中采用氮300 kg/hm2 +腐植酸150 kg/hm2(OF3)的施肥策略可显著提高海岛棉LAI和PAR截获率,保持较好光合特性促进产量的形成,有利于实现减氮和产量提升的双重目标。
In order to investigate the effects of nitrogen reduction and humic acid application on the photosynthetic characteristics and yield of island cotton in Xinjiang, island cotton ‘Xin 78’ was used as experimental material. Five treatments were set up, which were no nitrogen (CK), conventional nitrogen 600 kg/hm2(OF1), reduced nitrogen 300 kg/hm2(OF2), reduced nitrogen 300 kg/hm2 + humic acid 150 kg/hm2 (OF3) and humic acid 300 kg/hm2(OF4), respectively. The effects of different fertilization methods on the leaf area index (LAI), photosynthetic active radiation (PAR) interception rate, leaf SPAD, net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and yield of island cotton were analyzed. The results showed that: OF3 significantly increased LAI, PAR interception rate and leaf SPAD of Island cotton compared with CK. The LAI of OF3 reached its peak in the blooming period, and was 7.56%, 6.41% and 6.37% higher than CK, OF2 and OF4, respectively, with no significant difference from OF1 (P<0.05). The population PAR interception rate increased first and then decreased during the whole growth period, and the hammer distance of OF3 at the bolling stage could reach more than 0.9 at 70 cm, and the leaf SPAD of OF3 at full bolling stage was 6.00%, 4.77% and 3.67% higher than CK, OF2 and OF4, respectively (P<0.05), with no significant difference from OF1. Nitrogen reduction and humic acid application can maintain a higher level of photosynthetic characteristics, increase dry matter accumulation and increase the yield of island cotton. During the whole growth period, Pn, Gs and Tr of OF1 and OF3 island cotton were significantly higher than CK, OF2 and OF4, and there was no significant difference between OF3 and OF1 (P<0.05). The difference of photosynthetic parameters reached the maximum at the peak of bolling stage. Pn, Gs and Tr of OF1 were 2.62%, 1.75% and 1.51% higher than those of OF3, respectively, and the Ci of OF1 was 4.64% lower than that of OF3. At the same time, OF3 accelerated the dry matter accumulation of island cotton plant into the rapid accumulation period, which was 4 to 13 d earlier than CK, OF1, OF2 and OF4. OF3 increased the yield of island cotton by 6.31% to 20.89%. OF3 obtained the maximum accumulation rate (1.53 g/d) and growth characteristic value (60.67), which were 25.41% and 2.67% higher than OF1 respectively. In conclusion, the fertilization strategy of 300 kg/hm2 nitrogen and 150 kg/hm2 humic acid (OF3) in Xinjiang island cotton planting can significantly improve LAI and PAR of island cotton, maintain good photosynthetic characteristics and promote the formation of yield, which is conducive to achieving the dual goals of nitrogen reduction and yield improvement.
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新疆农业科学院自主培育专项(xjnkyzzp-2022002)
新疆维吾尔自治区重点研发计划(202107201)
国家重点研发课题(2022YFD1900105)
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