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Relationship between potassium fertilisation and nitrate assimilation in leaves and fruits of cucumber (Cucumis sativus) plants
Author(s) -
RUIZ J M,
ROMERO L
Publication year - 2002
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.2002.tb00177.x
Subject(s) - cucumis , potassium , biology , yield (engineering) , nitrate , nitrogen , horticulture , potassium nitrate , greenhouse , botany , agronomy , chemistry , ecology , materials science , organic chemistry , metallurgy
Summary The effect of application of different potassium rates on some parameters of nitrate metabolism and yield in cucumber plants (Cucumis sativus) was studied. All plants were grown under controlled conditions in an experimental greenhouse. The treatments consisted of applications of K + at three rates in the form of K 2 SO 4 (Kl: 0.075 mg ml −1 , K2: 0.15 mg ml −1 , and K3: 0.30 mg ml −1 ). The results showed a positive effect of higher K + fertilisation (0.30 mg ml −1 ) on uptake, translocation and reduction of NO 3 − in leaves compared with the lowest K + rate. In addition, the higher K + rates strengthened the translocation of organic nitrogenous compounds (amino acids) towards the fruit, thereby perhaps also enhancing the maximal commercial yield. In conclusion, for improved cucumber cultivation under greenhouse conditions, 0.15 mg ml −1 of K + gave maximal yield, while the application of 0.30 mg ml −1 increased the metabolism and efficient utilisation of NO 3 − .