Abstract
Forage cactus is perennial growth plant, resistance to drought adaptation to hot climate regions, being considered important for the development of livestock. In this study objective was estimate the morphometrics measures of forage cactus Giant Sweet clone associate the optimal levels water and salt. Design used was completely randomized, composed of four levels of water replacement, using the crop evapotranspiration (25, 50, 75 and 100%.Etc) and four levels of salinity (0, 2, 4 and 8 dS/m), obtained through the concentrations of (NaCl) salts corresponding to 0, 1.16, 2.32 and 4.64 g/L, respectively. The morphometric measures of cladodes were evaluated 20 times during the experimental period. Response surface was used to estimate the optimal levels water and salt that maximizing the morphometric measures of the cladodes. Water level in range of 54% and 64%, and 3.5 to 5.3 dS/m of saline level promote greater development of the Giant Sweet clone without changing the morphological characteristics of plant, generating greater phytomass yield.
Highlights
Use Forage cactus is commonly grown in semiarid areas because it shows great water-use efficiency due to its CAM metabolism, is an important animal-feed alternative, they present perennial growth, resistance to drought and low tolerance to salt stress (Pereira et al, 2018; Freire et al, 2018, Diniz et al, 2017)
Response surface methodology (RSM) stands out in the adjustment of growth curves, because that is useful when response of interest is influenced by two explanatory variables, and objectived optimize the response as a function of the combined effects of these variables (Lucena et al, 2019a and 2019b)
Soon the objective of this study was estimate the morphometric meansure of N. cochenillifera Giant Sweet clone associating water and salt stresses using response surface
Summary
Use Forage cactus is commonly grown in semiarid areas because it shows great water-use efficiency due to its CAM metabolism, is an important animal-feed alternative, they present perennial growth, resistance to drought and low tolerance to salt stress (Pereira et al, 2018; Freire et al, 2018, Diniz et al, 2017). Saline stress induces a reduction in CO2 assimilation and less plant growth and less dry matter production (Silva et al, 2018). Under these conditions make it necessary to study the growth of forage cactus. Adjustment of growth curves is an important tool to gain knowledge of the plant's growth and its phenological stages (Lucena et al, 2018; Moura et al, 2020). Studies reporting the association between water and saline stress in forage cactus at other stages of development were not found. Soon the objective of this study was estimate the morphometric meansure of N. cochenillifera Giant Sweet clone associating water and salt stresses using response surface
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