By Michael Raviv
This e-book isn't just practial for growers, but in addition medical for academicians. It covers all crucial wisdom approximately soilless tradition.
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Additional resources for Soilless Culture: Theory and Practice
Wheat, on the other hand, when the level of P in the soil is high at germination, will take all the P needed by the plant by about day 100 of growth (Williams, 1948), and in the last 40 days of growth, P in the grain is derived from the vegetative parts. However, when a plant is deficient in P, the roots continue to take up P from the soil until the seeds finish developing. It is therefore safe to conclude that it is the internal metabolism of the plant that controls the root’s uptake of P from the soil.
The optimum temperature for root growth is species, and even cultivar, specific (Cooper, 1973). This author summarized early studies on plant growth and nutrientuptake responses to root temperatures. For most commercially grown crops, the response curve to root temperature shows an optimum with a slow decreasing slope towards the cold zone and a sharp negative response when root temperatures are above the plant’s optimum as shown in Fig. 5. The knowledge of such a response curve for any specific crop is essential to nursery and glasshouse container-grown crops, especially in hot climates.
1985). Oxygen-dependent exclusion of sodium ions from shoots by roots of Zea mays (cv. Pioneer 3906) in relation to salinity damage. , 79(1), 171–176. T. P. (1990). Influence of root zone restriction on mineral element concentration, water potential, chlorophyll concentration, and partitioning of assimilate in spreading euonymus (E. kiautschovica Loes. ‘Sieboldiana’). J. , 13, 677–699. F. (1937). Hydroponics – crop production in liquid culture media. Science, 85, 177–178. E. and Sands, R. (1984).