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| Author(s): |
Rodolfo de Niro Gazola
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Ilha Solteira. 2018-01-17. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira |
| Defense date: | 2017-12-21 |
| Advisor: | Salatiér Buzetti |
| Abstract | |
The areas of eucalyptus cultivation have occupied new regions of Brazil, being that the state of Mato Grosso do Sul leads this expansion. In these new areas, the soil and soil conditions of the Cerrado biome have low natural fertility, with low availability of phosphorus (P) and potassium (K), and low organic matter (OM), in addition, the climate is characterized by the presence of accentuated and frequent water deficit. Therefore, the lack of nutrients in the soil combined with climatic conditions influence the development of the crop. In this context, the objective was to evaluate the nitrogen, phosphate and potassium fertilization given to the importance of these nutrients in the eucalyptus crop and its limitations in the soil under study. The experiment was conducted at Fazenda Renascença, an agricultural fund managed by Cargill Agrícola S / A, located in the municipality of Três Lagoas / MS, from September 2011 to July 2017, in a Entisols. A randomized block design with four treatments and five replications. The treatments were composed rates of nitrogen (N) (0, 70, 105 and 140 kg ha-1), P (0, 40, 70 and 100 kg ha-1 P2O5) and K (0, 90, 135 and 180 kg ha-1 K2O). Each plot was composed of 56 plants, distributed in seven lines of eight plants each, totaling 420 m2. In the planting lines, the seedlings of clone I144 (Eucalyptus urophylla) were spaced at 2.5 m and in between lines at 3.0 m. The following were evaluated: wood productivity; nutrient concentrations in leaves; foliar productivity, nutrient concentrations and transfer of foliage; the availability of macronutrients in soil; nutrient balance in leaves and soil (isometric log ratio); production, nutrient concentrations and their accumulation in the biomass and the efficiency in the use of the nutrients. Nitrogen, phosphate and potassium fertilization increased biomass production, wood volume and nutrient stock in biomass. N rates influenced leaf and leaf N concentrations in leaf balances of [N | P], [K | Ca, Mg] and [Ca | Mg and K cycling and did not interfere in leaf productivity, P, K, Ca, Mg and S contents in the soil and nutrient utilization efficiency. The P rates influenced positively the transfer of P and K to soil, in the leaf balance of [N | P] levels in soil P and did not interfere with leaf productivity, soil K, Ca, Mg and S contents and nutrient utilization efficiency. The K rates influenced positively K concentrations and negatively Mg concentrations in leaf and leaf, K and Mg transfer to soil, in the leaf swings of [K | Ca, Mg] and [Ca | Mg] and the soil of [K, Ca, Mg | H + Al] and [K | Ca, Mg] in the efficiency of N utilization and did not interfere in leaf productivity and soil P, Ca, Mg and S contents. (AU) | |
| FAPESP's process: | 14/02641-6 - Nitrogen, phosphorus and potassium fertilization on productivity, nutrient cycling and nutrition balance of eucalyptus |
| Grantee: | Rodolfo de Niro Gazola |
| Support Opportunities: | Scholarships in Brazil - Doctorate |