共查询到20条相似文献,搜索用时 672 毫秒
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E. Westphal 《Scientia Horticulturae》1987,30(4):316-318
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A. Scaife 《Scientia Horticulturae》1982,18(2):192-193
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Robert H. Gardner 《Landscape Ecology》2010,25(8):1301-1302
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Erling Stromme 《Scientia Horticulturae》1982,17(2):197-199
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R.L.M. Pierik 《Scientia Horticulturae》1984,24(1):93
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A. Baille 《Scientia Horticulturae》1997,70(4):361-362
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Samuel K. Riells 《Landscape Ecology》2005,20(4):495-496
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K.C. Sink 《Scientia Horticulturae》1978,8(1):91-92
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Regulation of K uptake, water uptake, and growth of tomato during K starvation and recovery 总被引:2,自引:0,他引:2
In order to analyze the dynamics of growth, water and K uptake, the effects of 1, 3 and 7 days of potassium starvation and the recovery capability during 7 days afterwards were investigated in vegetative tomato plants. After 7 days of K starvation, plant dry matter was reduced by 36% compared to control plants. After 3 days of starvation plants showed a 15% reduction in dry matter and a 25% reduction in growth rate (not statistically significant). K starvation reduced leaf area and specific leaf area (SLA) and it increased leaf dry matter percentage. K starvation enhanced dry matter partitioning into the roots at the expense of the stem. Plant K concentration was reduced by K starvation with the strongest effect in the leaves and roots. When a 3-day K starvation period was followed by 7 days of recovery with full strength nutrient solution, growth and plant K concentration completely recovered, but not after 7 days of K starvation. Xylem sap flow was reduced by K starvation and after 7 days of starvation the K concentration in the sap was reduced by 60%. During the starvation period, the reduction in relative growth rate was linearly related to the plant K concentration. The critical potassium concentration in the plant (the K concentration at which relative growth rate was reduced by 10%) was determined according to the nutrient interruption technique. The critical concentration was 4.3% K which was reached after 2.5 days of K starvation while the potassium concentration of control plants was 6.3%. During recovery the dry matter growth rate seemed to be the most important factor determining K uptake. 相似文献
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J. Dekker 《Scientia Horticulturae》1983,20(1):109-110