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Abstract
ABSTRACT The objective of this study was to evaluate the nutrient contents in ‘Tommy Atkins’ mango leaves at the flowering and fruiting stages under different strategies to reduce irrigation levels during flower induction. Five irrigation level reduction strategies, based on crop evapotranspiration (ETc) were used in the plots: T1 (0% ETc), T2 (25% ETc), T3 (50% ETc), T4 (75% ETc) and T5 (100% ETc); two production cycles in the split-plots; and in two development stages, flowering and harvest, in the split-split plots. The content of N, P, K, Ca, Mg, and S, as well as B, Cu, Fe, Mn, Zn, and Na was determined and leaf chlorophyll index was measured during the second cycle. The content of P, K, Mg, and Cu in the ‘Tommy Atkins’ mango trees leaves varied according to phases and cycles, regardless of the strategies to reduce irrigation levels in floral induction. The contents of N, Ca, B, Fe, Mn, and Na varied with stages and with the production cycles, in an independent manner. Foliar N contents were above the sufficiency range at the different development stages and cycles evaluated. The indices of a, b, and total chlorophyll varied independent of reading time. The nutrient contents with lower mobility in the plant, Ca, B, Fe and Mn increase in ‘Tommy Atkins’ mango trees leaves from flowering to fruiting, with the return of irrigation at 100% crop evapotranspiration, while the levels of N, P, K and Mg, nutrients with high mobility in plant decrease.
Highlights
The mango (Mangifera indica L.), native of Asia, is grown in Brazil in diverse ecosystems with different technological levels
In mango production system in the semi-arid region, the management of irrigation with water deficit is used as flowering inducer (BASSOI, 2012)
The reduction of the amount of water applied through the reduction of irrigation levels in mango floral induction process, can alter the availability of nutrients in the soil and, their content in the plant
Summary
The mango (Mangifera indica L.), native of Asia, is grown in Brazil in diverse ecosystems with different technological levels. In 2012 the Brazilian production of mangoes exceeded 1,175,000 tons, the Northeast accounting for 66.54% of total production been Bahia the largest fruit producing state, with 54% of production (IBGE, 2014). This region has favorable climatic characteristics, linked to irrigation management and fertilization that promote the successful development and production of the culture. In mango production system in the semi-arid region, the management of irrigation with water deficit is used as flowering inducer (BASSOI, 2012). The reduction of the amount of water applied through the reduction of irrigation levels in mango floral induction process, can alter the availability of nutrients in the soil and, their content in the plant
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