作物学报 ›› 2015, Vol. 41 ›› Issue (01): 80-88.doi: 10.3724/SP.J.1006.2015.00080
邹芳刚1,2,张国伟1,王友华1,赵文青1,周治国1,*
ZOU Fang-Gang1,2,ZHANG Guo-Wei1,WANG You-Hua1,ZHAO Wen-Qing1,ZHOU Zhi-Guo1,*
摘要:
以长江流域大面积种植的转基因棉湘杂棉8号为材料,在江苏省大丰市稻麦原种场(33.2°N,120.5°E)滨海改良盐土上研究施氮量(0、150、300、375、450、600 kg N hm–2)对棉株钾素吸收、利用和分配的影响。结果表明,增施氮肥提高不同生育阶段棉株钾的吸收量,以盛花到见絮期的钾积累增量最大,并改变生育期间的钾吸收比例,使出苗到盛花期的钾吸收比例降低,盛花到吐絮期的钾吸收比例升高;同时,增加施氮还降低生育后期中上部果枝钾浓度的下降速率,但对下部果枝影响较小。随施氮量增加,各部位果枝氮对钾吸收的边际效应(每增施1 kg氮促进钾的吸收量)呈先升高后降低趋势,且果枝部位越高,基于最大边际效应的施氮量越高。在300~375 kg hm–2施氮量范围内,干物质和钾在经济器官中的分配比例提高,钾浓度和钾累积量动态特征参数比较协调,中部和上部果枝氮素对钾吸收的边际效应和钾的皮棉生产效率较高,利于高产形成。高于375 kg hm–2的施氮量导致皮棉产量增幅下降,氮素对钾吸收的边际效应和钾的皮棉生产效率较低;低于375 kg hm–2的施氮量降低干物质和钾经济系数,不利于高产形成。
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