ISHS Acta Horticulturae 35: Symposium on Water Supply under Glass and Plastics
III. WATER APPLICATION SYSTEM WITH RESPECT TO PLANT - THE EFFECT OF SOIL MOISTURE REGIME ON ROSE PRODUCTION UNDER PROTECTED CONDITIONS |
| Authors: | Z. Plaut, I. Arnon, N. Zislin, E. Shmueli |
| Abstract:
The effect of irrigation regimes and growth media on the production and quality of Baccara roses was examined in a greenhouse during the 1969/70 and 1970/71 seasons. The media were (1) sandy loam placed on top of the local soil, (2) sandy loam, (3) sandy loam mixed with peat moss, and (4) lapilli tuff; all except (1) were in raised benches. Two levels of fertilizers were examined in the tuff media. The irrigation regimes in the soil media were established according to pre-irrigation moisture potentials in the range of -5 to -50 centibars. In tuff media the irrigations were scheduled at different frequencies ranging from eight irrigations per day to one irrigation every 2–3 days. Maximal flower production, of 150 flowers per 1 m2 in 1969/70 and of 185 in 1970/71, was obtained in sandy loam which was placed on top of the local soil and irrigated so that the soil moisture potential did not drop below -5 cb. There was a decrease in yield in both seasons when the water potential was lower. The distribution of flower grades was unaffected by irrigation regimes in this growth medium. No significant difference in flower production was found between 5–8 and 2 irrigations per day in the tuff medium. The response of flower production to growth media and irrigation regimes was most apparent during the mid-winter and spring. | |
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