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Universidade Federal de Viçosa (2014)

Manejo da irrigação na indução floral e na fase produtiva da mangueira Tommy Atkins em condições semiáridas

Faria, Leandro Neves

Titre : Manejo da irrigação na indução floral e na fase produtiva da mangueira Tommy Atkins em condições semiáridas

Irrigation management of floral induction and productive phase of ’Tommy Atkins’ mango trees under semiarid conditions

Auteur : Faria, Leandro Neves

Université de soutenance : Universidade Federal de Viçosa

Grade : Doctor Scientiae 2014

Résumé partiel
Some of the major issues involving the Brazilian mango tree crop are related to fruit production season and production irregularities. The climatic conditions of the region, combined with irrigation, favors greater productivity as a result of plant adaptation and differentiated behavior. The water stress technique applied for floral induction in mango tree crop usually consists in a gradual reduction of the amount of irrigation water, aiming at a more rapid and uniform branch maturation, with the plant photosynthesizing and accumulating reserves. Thus, the objective of this work was to define irrigation management to optimize off season production of ‘Tommy Atkins’ mango trees under Bahia semiarid region conditions. The Article 1 experiment was arranged in a randomized complete block design, with seven treatments (irrigation) and six replicates for the Regulated Deficit Irrigation management - RDI, and five treatments and six replicates for the alternate Partial Rootzone Drying irrigation management - PRD, with each plant corresponding to an experimental unit. The irrigation depth was reduced from 100% based on daily evapotranspiration of the crop. The RDI and PRD management treatments were applied at the three stages of fruit development, SI – from flowering to fruit set (65 days) ; SII – fruit development (30 days) ; and SIII – fruit physiological maturation (25 days). The RDI management treatments were : T1 (100% ETc at all phases of fruit development) ; T2 (100% ETc at SII and SIII, and 50% Etc at SI) ; T3 (100% ETc at SI and SIII, and 50% ETc at SII) ; T4 (100% ETc at SI and SII, and 50% ETc at SIII) ; T5 (100% ETc at SII and SIII and 75% ETc at SI) ; T6 (100% ETc at SI and S III and 75% ETc at SII) and T7 (100% Etc at SI and SII and 75% ETc at SIII). The PRD management treatments were : T1 (100% ETc using the conventional drip method) ; T2 (100% ETc) ; T3 (80% ETc) ; T4 (60% ETc) and T5 (40% ETc), with T2, T3, T4, and T5 PRD alternating the side to be irrigated every 15 days from flowering to harvest. The experimental design in Articles 2 and 3 was arranged in a randomized complete block design, consisting of the following five treatments applied at two developmental stages, SI-flowering and S2-fruit production : T1 (0% ETc, no irrigation in SI and 100% ETc in SII), T2 (25% ETc in SI and 100% ETc in SII), T3 (50% ETc at SI and 100% ETc at SII), T4 (75% ETc in SI and 100% ETc in SII) and T5 (100% ETc in SI and SII). The PRD treatments had no effect on mango plant productivity. However, the RDI irrigation management, alternating sides every 15 days with 40% of ETc provided greater water use efficiency.

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