Interactive effects of salinity and nitrogen on growth and yield of tomato lycopersicon esculentum cultivar vf 145 plants

Papadopoulos, I.; Rendig, V.V.

Plant and Soil 73(1): 47-58

1983


ISSN/ISBN: 0032-079X
Accession: 005728042

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Abstract
Tomato plants were grown with Typic Xerofluvents soil in a greenhouse irrigated with recycled nutrient solutions having increasing levels of N and salinity. Positive response of plants to increasing levels of N was obtained at the lowest initial salinity level of 1 dS/m (dS/m = mmho/cm, referenced at 25.degree. C). At the higher initial salinity levels of 5 and 9 dS/m, increasing N was ineffective in counteracting adverse effects on growth and yield caused by the presence of enhanced salt concentrations of the nutrient solution. Total N uptake was linearly correlated with the total water uptake and was severely suppressed by impaired growth associated with the 2 higher initial salinity levels, irrespective of N levels. The effect of salinity on leaf N concentrations changed over time. Leaf Cl and P concentrations indicated a possible suppressing effect of Cl on P uptake into plant tops.