FERNANDES, O. B.; http://lattes.cnpq.br/4342113783812881; FERNANDES, Otoniel Batista.
Résumé:
The irrigation has been pointed out as the main alternative for socioeconomical
development of semi-arid regions. However, when improperly done it
facilitates the soil salinisation and the degradation of hydric and edophic means.
Thus, the aim of this work was to evaluate the effect of the use of calcium nitrate on
the reduction of stress on the melon plants exposed to excess salt in the irrigation
water. The experiment was carried out at the Centro de Ciências e Tecnologia
Agroalimentar (CCTA/UFCG), Pombal-PB, from 09/19/2009 to 1 1/20/2009, using the
hybrid melon 'Hales Best Jumbo'. The treatments were done by means of the use of
two leveis of salinity of the irrigation water (0.3 and 5.0 dS m'l) versus rates of N in
the form of calcíum nitrate (5.51 6.251 7.0 and 8.5 g per plant). The experimental
design was randomized blocks, on the factorial scheme 2x4, with four repetitions.
The hlghest rates of photosynthesis, stomatic conductivity, transpíration, leaf área,
total dry mass and the fruit yield per plant were observed on melon plants irrigated
with normal water(0.3 dS m'l) compared to the ones with the saline water(5.0 dS m
'), and on rates of N between 6.10 and 8.5g of N per plant for both leveis of salinity.
The furnishing of N in the form of calcium nitrate was effective on reducing the melon
plant the stressing effect caused by the salinity of the irrigation water up to the rates
of 6.20g of N per plant. On absolute terms we can affirm that the best performance of
the melon plant was achieved with the dose of 6.25g of N per plan when irrigated
with normal water.
