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Sprosswasserpotenzial, Fotosynthese und Aufteilung von Kohlenstoff bei Mungbohne und Kuhbohne in Abhängigkeit vom Bodenfeuchtigkeitsgehalt und Kaliumdünger
Author(s) -
Sangakkara U. R.,
Frehner M.,
Nösberger J.
Publication year - 2000
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1046/j.1439-037x.2000.00422.x
Subject(s) - vigna , agronomy , radiata , photosynthesis , legume , shoot , irrigation , water content , moisture , soil water , water use efficiency , fertilizer , biology , chemistry , botany , ecology , geotechnical engineering , organic chemistry , engineering
The effect of different rates of potassium (K + ) on shoot water potential, photosynthesis and carbon movement (using 14 C) at the V3/4 growth stages was studied in mungbean ( Vigna radiata L. Wilczek), a drought‐susceptible legume, and cowpea ( Vigna unguiculata L. Walp), a drought‐tolerant legume, grown under low‐ and high‐irrigation regimes under controlled conditions. Soil moisture and K + affected all measured parameters in the two species. The rate of photosynthesis was higher at reduced water stress when K + was applied. The impact was greater in cowpea, which had an inherently high rate of carbon assimilation. Mungbean and to a lesser extent cowpea allocated greater quantities of carbon to roots under dry conditions, especially with added K + . The distribution of 14 C into other plant parts was also increased at higher rates of K + application under both soil moisture regimes. Thus, application of K + seems to have a beneficial effect in overcoming soil moisture stress and increasing physiological parameters and carbon partitioning in these two important tropical food legumes.