期刊
PLANT PRODUCTION SCIENCE
卷 5, 期 4, 页码 281-285出版社
CROP SCIENCE SOC JAPAN
DOI: 10.1626/pps.5.281
关键词
interaction; komatsuna; photosynthetic activity; potassium; seawater; sodium; spinach; stomatal conductance
类别
Two cultivars of spinach and one cultivar of komatsuna were sand cultured using a nutrient solution with Na and K in various combinations. The growth (fresh weight of shoot) of spinach cv. Atlas was significantly increased when 1.4 mM KCl of the 7 mM KCl was replaced with 1.4 mM NaCl, although the growth was reduced when more KCl was replaced with NaCl. In another spinach cv. All Right, however, NaCl substituting for 20% of KCl showed no significant effects. In komatsuna, Na used in place of K at any ratio reduced the growth. The growth of spinach cv. Atlas was increased by applying 20 mM NaCl, irrespective of K dose (480 - 2400 mgK(2)O per 1/2000 a Wagner pot). The growth of spinach cv. All Right was also increased by 20 mM NaCl when K was at a deficient level (480 - 960 mg K2O per pot), but was not when K was at an excessive level (1920 - 2400 mg K2O per pot). In komatsuna, 20 mM NaCl reduced the growth. In spinach, Na prevented the decrease of the photosynthetic rate and stomatal conductance caused by K deficiency.
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