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| Author(s): |
Mateus Augusto Donegá
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2010-02-02 |
| Examining board members: |
Simone da Costa Mello;
Quirino Augusto de Camargo Carmello;
Luis Felipe Villani Purquerio
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| Advisor: | Simone da Costa Mello |
| Abstract | |
The management of nutrient solution takes into account nutrient concentrations and relationships between nutrients to achieve high productivity and quality of vegetables grown in hydroponic systems. The appropriate ratio between K and Ca is essential for maximum absorption of these elements, once an excessive amount of K may reduce Ca absorption, and vice versa. Besides the elements considered essential, benefic elements such as silicon may not only stimulate absorption of other nutrients, including Ca, but also increase productivity and longevity of postharvest products. This work aimed to study the influence of relations K: Ca 0,75:1,0; 1,25:1,0 and 1.5:1.0 and application of silicon (0 to 56 mg L-1) nutrient solutions on growth, productivity, nutrient uptake at 7, 14, 21 and 28 days after transplanting (DAT), and postharvest quality coriander Português Pacific, grown in hydroponic system NFT. The experiment was in randomized blocks in factorial scheme 3x2, that is, three ratios K: Ca and two doses of Si, in split plot in time, valued at four times (7, 14, 21 and 28 days after transplanting, DAT) with four replications. The K: Ca 1,50:1,0 and 1,25:1,0 ratio originated more vigorous plants for plant height, fresh and dry weight of shoots and roots, leaf area and leaf number. Si increased in fresh weight of shoots and roots and number of leaves at 28 DAT. The K: Ca 0,75:1,0 ratio in Si the presence of a greater number of stomata under the leaf. The thick spongy parenchyma was obtained with K: Ca 1.5:1.0. In the presence of Si, the ratio K: Ca 1.5:1.0 was the one that created a greater thickness of the palisade and mesophyll. The order of uptake, both in shoots and roots was: K> N> Ca> P> Mg> S. The accumulation of N, P, K, Ca, Mg, S and Si in shooting accounted for 85%, 79.9%, 89.2%, 86.4%, 77.8%, 82.3% and 58.1%, respectively, compared to the total. In three days of coriander storage less weight loss occurred in treatments with silicon in the nutrient solution. (AU) | |