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在小麦生长发育中,利用植物分析法测定干物质(DM)积累、叶面积(LA)生长以及相关过程中的相对叶生长率(RLGR),相对生长率(RGR)、净吸收率(NAR)和作物生长率(CGR)对钾的需求量。由营养液供给小麦(Triticum aestivum cv.HD2329)的植株从缺乏到满足一系列不等量的K。在特定阶段对样本进行K的测定。在45天、75天和105天时对DM和LA进行测定。对小麦生长发育过程中的RGR、NAR和CGR分别在30—45天、45—75天和75—105天间进行测定。对RLGR分别在15—30天、30一45天和45—75天间进行观测。30天和45天时全株K的浓度以及75天和105天时顶部二片叶中K的浓度与作物产量、生理过程相关。结果表明,植株内K状态对叶面积的形成影响甚大,而且又影响RLGR、RGR和CGR,最终影响到产量。植株营养生长所需的最适浓度往往要低于产量形成时所需的最适浓度。
In wheat growth and development, plant analysis was used to determine dry matter (DM) accumulation, leaf area (LA) growth and relative leaf growth rate (RLGR), relative growth rate (RGR) and net absorption rate (NAR) And crop growth rate (CGR) for potassium demand. Plants supplied with nutrient solution from wheat (Triticum aestivum cv. HD2329) lacked to meet a range of unequal amounts of K. The sample is subjected to the determination of K at a specific stage. DM and LA were measured at 45, 75 and 105 days. RGR, NAR and CGR during wheat growth and development were measured at 30-45 days, 45-75 days and 75-105 days respectively. RLGR were observed in 15-30 days, 30-45 days and 45-75 days respectively. The whole plant K concentrations at 30 and 45 days and the K concentrations in the top two leaves at 75 and 105 days were related to crop yield and physiology. The results showed that the K state in plants had a great influence on the formation of leaf area, but also influenced the RLGR, RGR and CGR and finally affected the yield. The optimum concentration for plant vegetative growth is often lower than the optimum concentration required for yield formation.