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| Author(s): |
Richardson Barbosa Gomes da Silva
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Botucatu. 2017-05-31. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agronômicas. Botucatu |
| Defense date: | 2017-03-29 |
| Advisor: | Magali Ribeiro da Silva |
| Abstract | |
In many nurseries, the personal experience of nurseries is the primary method used to determine when and how much time to irrigate. Nurseries produce several species simultaneously in the same area. Among the species, there is much variation in foliar architecture, specifically in the leaf angles. The lack of knowledge about the proper water depth and how the leaf angles affect the interception and capture of water, limit irrigation efficiency and consequently seedlings quality. The objective of this study was to evaluate if the leaf angle of nine species of tree seedlings and the water depths applied in the nursery affect the morphological, physiological and nutritional seedlings quality; the leaching fraction and the electrical conductivity of the solution leached; and the morphological quality of the plants after planting in pot. The evaluations were performed at the end of the production cycle of each species in the nursery, through the following variables: height, stem diameter, shoot, root and total dry mass, Dickson quality index, crown projection area, conformation root system, leaf water potential, SPAD index, daily perspiration, leaf chlorophyll a, b, carotenoids and anthocyanins, leaching fraction, electrical conductivity of the solution leached and nutritional accumulation. The morphological quality of the plants after planting was evaluated at intervals of 30 days, during 120 days, through the variables height of and stem diameter. Here we show that, in species with larger leaf angles, the application of smaller water depths results in seedlings with higher quality. In species with smaller angles, it is necessary to apply larger water depths, except when crown projection area of seedling is small. From this knowledge, leaf angle can begin to be adopted among the criteria to group the species in the nursery, so that the irrigation practiced avoids the waste of water and fertilizers, as well as increase the morphological, physiological and nutritional tree seedlings quality. (AU) | |
| FAPESP's process: | 13/17447-8 - Water management on the development and quality of native seedlings with different architectures |
| Grantee: | Richardson Barbosa Gomes da Silva |
| Support Opportunities: | Scholarships in Brazil - Doctorate |