While the Clintons grew some vegetables in pots on the White House roof, the Obamas' garden will far transcend that, with 55 varieties of vegetables — from a wish list of the kitchen staff — grown from organic seedlings started at the Executive Mansion's greenhouses.
But the Obamas' garden will have 55 varieties of vegetables -- from a wish list of the kitchen staff -- grown from organic seedlings started at the executive mansion's greenhouses.
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The cultures were grown in vases to ensure the penetration of enough light for optimal physiological processes of assimilation of nutrients from the culture medium, seed germination, photosynthesis, development of organic substances, seedling growth, and further development of the plants.
While a similar response to drought was observed in this study regardless of media type, future studies should examine the long-term effects of using native soils rather than organic media on seedling growth and survival under drought conditions.
In mineral soils relative to organic media, total seedling biomass was 14% less (F = 4.987, df = 1, P = 0.03), shoot biomass was 35% less (F = 55.498, df = 1, P < 0.001), and root biomass was 42% more (F = 8.881, df = 1, P = 0.004), but the control seedlings in the granitic soil were mainly responsible for this difference.
Secretion of H2O2 from roots and the added degradative capacity of the rhizobacteria increased organic N acquisition by seedlings ∼119.74 % over what was seen in the seedlings without microbes or secreted H2O2.
Canellas et al. [36] observed changes in profile exudation of organic acids by maize seedlings treated with HS (Figure 6).
Quantities of fatty acids, phenols, and organic acids exuded by seedlings treated with humic acids alone differed from the quantities exuded in other treatments.
Canellas et al. [12] and Puglisi et al. [13] previously observed changes in exudation profiles of organic acids in maize seedlings treated with humic acid.
Drought-stressed seedlings in organic media produced as much shoot biomass as the non-drought-stressed seedlings in the mineral media.
