WATER BALANCE IN SOIL CULTIVATED WITH FORAGE CACTUS CLONES UNDER IRRIGATION

Authors

  • Poliana de Caldas Pereira Department of Agricultural Engineering, Universidade Federal de Viçosa, Viçosa, MG
  • Thieres George Freire da Silva Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE
  • Sérgio Zolnier Department of Agricultural Engineering, Universidade Federal de Viçosa, Viçosa, MG
  • Sérvulo Mercier Siqueira e Silva Instituto Agronômico de Pernambuco, Arcoverde, PE
  • Marcelo José da Silva Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE

DOI:

https://doi.org/10.1590/1983-21252017v30n326rc

Keywords:

Evapotranspiration. CAM plants. Opuntia spp.. Nopalea sp..

Abstract

Forage cactus species may belong to different genera (such as Opuntia and Nopalea), which can result in different water dynamics at the biosphere–atmosphere interface. The objective of this study was to analyze the water balance in soil cultivated with forage cactus clones under different conditions of soil water availability in the Brazilian semi-arid. The experiment was conducted in the municipality of Serra Talhada, State of Pernambuco. The crop was subjected to nine treatments arranged in a randomized complete block design with three replications in a factorial arrangement of 3x3. The plots were composed of three water availability conditions, with the application of a water depth of 7.5 mm at intervals of 7, 14, and 28 days, and the subplots consisted of three forage cactus clones (IPA Sertânia, Miúda, and Orelha de Elefante Mexicana). The soil water balance (SWB) method was applied, and the ET/ETo ratio was estimated (ET is the actual crop evapotranspiration, and ETo is the reference evapotranspiration) at intervals of 14 days; the results were represented in nine periods of 28 days. There was a difference between SWB components along the cycle and between irrigation conditions (p < 0.05). Nevertheless, ET and rainfall were the most important components in SWB when irrigation was performed. There was no difference in water consumption between forage cactus clones belonging to different genera, resulting in an average of 1.50 mm day-1. The ET/ETo ratio had low magnitude (0.29 ± 0.12), indicating that the ET was more dependent on the water regime than on the atmospheric demand.

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Author Biographies

Poliana de Caldas Pereira, Department of Agricultural Engineering, Universidade Federal de Viçosa, Viçosa, MG

Doutoranda em Meteorologia Agrícola

Thieres George Freire da Silva, Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE

Professor da Área de Agrometeorologia

Sérgio Zolnier, Department of Agricultural Engineering, Universidade Federal de Viçosa, Viçosa, MG

Professor de Agrometeorologia

Sérvulo Mercier Siqueira e Silva, Instituto Agronômico de Pernambuco, Arcoverde, PE

Pesquisador de Irrigação e Drenagem

Marcelo José da Silva, Academic Unit of Serra Talhada, Universidade Federal Rural de Pernambuco, Serra Talhada, PE

Graduando de Agronomia

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Published

21-03-2017

Issue

Section

Zootechnics