应用生态学报2017，Vol.28Issue(11)：3562-3570,9.DOI:10.13287/j.1001-9332.201711.030
幼穗分化期喷施磷钾肥对早稻抵御低温及产量和生理特性的影响
Effects of spraying P and K fertilizers during panicle primordium differentiation stage on cold resistance, yield and physiological characteristics of early rice
摘要
Abstract
Super hybrid early rice variety Ganxin 203 was used as test material,and four foliar spraying treatments were set using clear water as the control group (CK),and 3 concentrations of potassium dihydrogen phosphate (KH2POa) with 0.1％ (P1),0.3％ (P3),0.5％ (P5) arid potash (MH).The effects of spraying P and K fertilizers on the leaf temperature,yield and physiological characteristics in double-season early rice under low temperature conditions during panicle primordium differentiation stage were studied.The results showed that during the low temperature period 6:00-18:00,rice leaf temperature under the different treatments with potassium dihydrogen phosphate and potash was higher than that of CK.Leaf chlorophyll content and net photosynthetic rate (Pn) of rice plants decreased gradually with the treatments under low temperature,while the reduction range was the smallest in treatment P3.The activities of the antioxidative enzymes varied to different extents,and the increase range for the activities of superoxide dismutase (SOD) and peroxidase (POD) in treatment P3 were higher than those in the other treatments.The decrease range of the activity catalase (CAT) in treatment P3 was lower than that in the other treatments.At the end of low temperature treatment,malondialdehyde (MDA) content was the highest in CK.Under low temperature,foliar spraying of potassium dihydrogen phosphate or potash could improve dry matter accumulation to varying degrees and achieve the purpose of slowing down the yield decrease,among which treatment P3 was the best.It could be found from the yield components that the total grains per panicle,seed setting rate and 1000-grain mass were significantly improved for all treatments compared to CK.The application of foliar spraying of 0.3％ potassium dihydrogen phosphate was the most effective agronomic measure to enhance the resistance to low temperature during panicle primordium differentiation stage for double-season super hybrid early rice.关键词
早稻/幼穗分化期/低温/磷钾肥/叶温/生理指标/产量Key words
early rice/panicle primordium differentiation stage/low temperature/P and K fertilizer/leaf temperature/physiological characteristics/yield引用本文复制引用
曹娜,陈小荣,贺浩华,朱昌兰,才硕,徐涛,谢亨旺,刘方平..幼穗分化期喷施磷钾肥对早稻抵御低温及产量和生理特性的影响[J].应用生态学报,2017,28(11):3562-3570,9.基金项目
本文由国家公益性行业(气象)科研专项(GYHY201406025)、国家公益性行业(农业)科研专项(201403002)和江西农业大学研究生创新基金项目(NDYC2015-S004)资助 This work was supported by Special Project for Scientific Research in the Public Interest (Meteorology)(GYHY201406025) and Special Fund for Agro-scientific Research in the Public Interest (201403002) and Jiangxi Agricultural University Graduate Student Innovation Fund Project (NDYC2015-S004). （气象）
