Genotypic differences in nitro gen efficacy of cucumber plants
Abstract
Two cultivars of the cucumber plant (Marketmore and Pepino de China) supplied
with two total N levels (14 and 7 mol m-3) and a N03-/NH/ ratio of 60/40 were grown
aeroponically in a glasshouse. In order to known the N efficacy differences between the
cultivars, several parameters were chosen, such as dry matter production; the ratio of
rootlshoot weight; NR activity; commercial yields; N03-, NH4+ and total N consumptions;
leaf and root concentrations. The results obtained displayed that Marketrnore produced
higher yields and lower vegetative weigth than Pepino de China, showing furthermore the
highest ratios offruit weight, N03-, NH/ and total N consumptions for the treatment with
7 mol m-3 of total N. The data obtained can be used for an adequate selection of cultivars
characterized by a high N efficacy even for low N amounts.
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References
different soil N and moisture regimes: I. Dry matter partitioning and root growth. J Plant
Nutr., 17:729-744.
SWIADER, J. M., CHYAN, Y. and FREIJI, F. G. (1993): Genotypic differences in NO)uptake
and utilization efficiency in pumpkin hybrids. J. Plant Nutr., 16:445-460.
CURE, R. B., ISRAEL, D. W. and RUFTY, T. W. Jr. (1988): Nitrogen stress effects on
growth and seed yield of monnodulated soybean exposed to elevated COz. Crop Sci.,
28:671-677.
y AMBAO, E. B. and O'TOOLE, J. C. (1984): Effects of N nutrition and root mediurn
water potential on growth, N uptake and osmotic adjustrnent of rice. Physiol. Plant.,
60:507-515.
PAN, W. L., JACKSON, W. A. and MOLL, R. H. (1985): Nitrate uptake and partitioning
by com root systems. Plant Physiol., 75:560-566.
FEIL, B. (1994): Growth and NH/:NO)- uptake ratio of spring wheat cultivars under a
homogeneous and a spatiaIly separated supply ofNH/ and NO)-. J Plant Nutr., 17:717-728.
GAHOONIA, T. S., CLAASEN, N. and JUNGK, A. (1992): Mobilization of H2PO; in
different soils by ryegrass supplied with arnmonium or nitrate. Plant & Soil, 140:241-248 .
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