Absorption and critical levels of phosphorus in castor bean shoots grown in different soil classes
| Autor: | José Félix Brito, Leonardo Theodoro Büll, Napoleão Esberard Beltrão, João Paulo Gonsiorkiewicz Rigon, Valdinei Sofiatti |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Semina: Ciências Agrárias, Vol 35, Iss 1, Pp 239-250 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1679-0359 1676-546X |
| DOI: | 10.5433/1679-0359.2014v35n1p239 |
| Popis: | Soil that has a high degree of weathering, with more inorganic P bound to Fe and Al oxides, has less P availability to plants. Thus, the critical element of a plant refers to the level below which the growth rate and plant production decreases, demonstrating the need for supplementary fertilization. Accordingly, an experiment was conducted in a greenhouse at Embrapa Algodão with the objective of evaluating the response of castor plants to five doses of P in four types of soil with different adsorption characteristics and critical levels of foliar P. The experimental design was completely randomized in a 4 x 5 factorial design, four types of soil and 5 levels of P with four replications. For TCo, there was an increase in height growth, with dose of 229.6 mg dm-3 responsible for maximum plant height (74.3 cm). The largest diameter stem (17.58 mm) was observed in CXve with an application of 229.6 mg dm-3 of P; a decrease was seen when using higher doses. The increase in leaf area was smaller in RY (4724.8 cm2), where it was obtained with a dose of 280.2 mg dm-3. In general, critical levels of P in the plant shoots did not vary much between the soils. The critical level of P in castor bean shoot dry mass was higher (4.61 g kg-1) in TCo, this result being directly related to the low clay content of the soil. |
| Databáze: | Directory of Open Access Journals |
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