V. THE QUANTITIES OF IRRIGATION WATER - WATER RELATIONSHIPS OF LETTUCE CROPS UNDER GLASS

M. Dullforce, J. Garcia-Huidobro
The situation concerning irrigation of lettuce crops in glass houses will be reviewed. Jajmudar and Hudson (1957) carried out a series of experiments at different times of the year, subjecting the plants after planting out to a range of water deficits, the highest of which was equivalent to 0.8 bar as measured by soil moisture tensiometers. Jain (1962) developed the work further using shallow depths of soil, and the effects of a black polythene mulch were investigated. Acock (1967) examined the responses of young plants to "moderate" and "severe" stresses.

This work is being extended by the authors and an experiment was developed with the aim of studying the effects of different water regimes at three stages of growth, a) during germination, b) during the seedling stage and c) after planting in the glasshouse. A further experiment has analysed growth to maturity following different degrees of stress up to 15 bars applied in the seedling stage, in conjunction with the provision of supplementary lighting during the winter.

Dullforce, M. and Garcia-Huidobro, J. (1974). V. THE QUANTITIES OF IRRIGATION WATER - WATER RELATIONSHIPS OF LETTUCE CROPS UNDER GLASS. Acta Hortic. 35, 95-100
DOI: 10.17660/ActaHortic.1974.35.13
https://doi.org/10.17660/ActaHortic.1974.35.13

Acta Horticulturae