Fruit size, mineral composition and quality of trickle-irrigated tomatoes as affected by potassium rates

Auteur(s) :
Finger FL., Fontes PCR., Sampaio RA.
Date :
Jan, 2000
Source(s) :
PESQUISA AGROPECUARIA BRASILEIRA. #35:1 p21-25
Adresse :
FONTES PCR,UFV,DFT;BR-36571000 VICOSA,MG BRAZIL.pacerefo@mail.ufv.br

Sommaire de l'article

An experiment was conducted to determine the fruit size, mineral composition and quality of trickle-irrigated tomatoes as affected by potassium fertilizer rates. Six potassium (K) rates were applied as KCl, corresponding to 0, 48.4, 118.6, 188.8, 259.0 and 399.4 kg ha(-1), with four replicates, following a randomized block design. Quadratic responses to K rates were observed for double extra large (diameter > 60 mm), extra large (56 to 60 mm) and large (52 to 56 mm) fruit yields. Maximum yields of these classes were achieved with K rates of 116, 190 and 233 kg ha(-1), respectively. Fruit dry matter, phosphorus, sulfur and magnesium contents were not affected by K rates, but nitrate and K contents showed significant increments as K rates were increased. Vitamin C, total soluble solids, lycopene and beta-carotene contents in the fruits were not affected by K rates. Increments in the K rate lowered the fruit pH and increased total acids content.

Source : Pubmed
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