Abstract
SummaryTomatoes were grown in unheated plastic greenhouses in the soil or in 10–1 pots filled with two soils. Plants grown in pots had 18% lower yields than those grown direct in the soil. Soil-grown plants barely responded to N and K fertilizer because of residual soil N and K. The K requirement was less than the amount of K removed in the fruit. The fertilizer requirement of pot-grown plants producing 7 kg of tomatoes was 17 g थ, 4 g ऩ and 10 g ढ per plant. Maximum yields of pot-grown plants were associated with 4% N, 0.27% ऩ and 2.8% K in the leaves. Despite the low K status, fruit quality was acceptable, possibly due to the salinity of the irrigation water. In one experiment pot-grown plants received all their N as ammonium sulphate without obvious damage. The lower yield of pot-grown plants was attributed to water stress, since there was no response to increased application of N, P and K, but growing in pots filled with a sandy-loam soil appears to be commercially feasible.
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