By Nicolás Castilla
Greenhouse cultivation has accelerated in fresh a long time with elevated call for for nutrition creation and newly constructed applied sciences to enhance techniques. This ebook, which concentrates on plant construction grown in plastic greenhouse stipulations, covers starting to be recommendations comparable to fertilization and plant defense and up to date applied sciences and administration practices. It additionally takes an built-in method of greenhouse construction addressing concerns comparable to economics, advertising and marketing and creation strategies.
This is the English variation of the winning Spanish booklet released by means of Ediciones Mundi-Prensa, Madrid, and grants content material appropriate to Spanish and world wide construction.
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Extra resources for Greenhouse Technology and Management
RAW, readily available water; NRAW, not readily available water; RW, reserve water. 20 Considered relations: (1) (2) (3) (4) Total volume of substrate / (Volume of RAW + RW) Total volume of substrate / Air (Volume of RAW + RW) / Air Total volume of substrate / Total water volume 24 Plate 23. The volumetric relations of the water and air content of rockwool, depending on the height and width of the slab, represented in cross-section (adapted from Caldevilla and Lozano, 1993). RAW, readily available water; NRAW, not readily available water; RW, reserve water.
98 mmol m−2s−1 82 lux are much related to the change from liquid water to vapour and vice-versa. Once the solar radiation reaches the Earth’s surface, part of the radiation is reflected. The so called ‘albedo’ is the proportion of the incident solar radiation which is reflected over a certain surface over the whole range of the spectrum (Monteith and Unsworth, 1990), although some authors relate it only to visible light. , 2002). 4 Measurement of solar radiation The effects of radiation on plants are determined by the quantity and quality (wavelength) of the radiation impacting on them.
The water phase changes (solid, liquid or vapour) involve the transport of large amounts of energy, which affects the crop and its surrounding air temperatures. The atmospheric humidity and the availability of water, together with other factors, determine the rate at which plants transpire. The atmospheric air is never completely dry, containing some amount of water in the form of vapour. The water vapour content of air can be expressed in several ways: 1. By its concentration. This is the air absolute humidity (AH) which is expressed in kilograms of water vapour per kilogram of dry air.