Abstract
The objective of this work was to evaluate the influence of fertirrigation with nitrogen and liquid bovine biofertilizer on gas exchange and leaf chlorophyll index of 'paluma' guava (Psidium guajava L.). The experimental design was randomized blocks with treatments distributed in a factorial arrangement (2 × 4) referring to mineral fertilizing with N (50% and 100% of N recommended) and biofertilizer concentrations (0, 2.5, 5.0 and 7.5% of the fertirrigated volume). Variables evaluated were chlorophyll a (Chl a), chlorophyll b (Chl b), total chlorophyll indexes (Chltotal), internal CO2 concentration (Ci), stomatal conductance (gs), transpiration (E), net photosynthesis (A), instant carboxylation efficiency (iCE) and water use efficiency (WUE). The biofertilizer significantly affected Chl a, Chl b, Chltotal, A, gs and E, with quadratic polynomial adjustment of the results. However, there was no effect of N fertilization and interaction between the factors. Maximum index of Chltotal was 32.31 obtained with the estimated dose of 3.8% of the biofertilizer; while A, gs and E presented maximum responses of 19.09 µmol of CO2 m-2 s-1, 0.28 mol of H2O m-2 s-1 and 4.93 mmol of H2O m-2 s-1, with estimated doses of 3.6%, 3.6%, and 3.7%, respectively. Generally, liquid bovine biofertilizer applied via fertirrigation affects positively the photosynthetic responses in 'paluma' guava, however, with decreasing effects for doses above 3.8%.
Highlights
Guava (Psidium guajava L.) is a fruit of the Myrtaceae family, originally from South and Central America, and widely cultivated in Brazil, mainly in its semiarid portion
The objective of this work was to evaluate the influence of fertirrigation with nitrogen and liquid bovine biofertilizer on gas exchange and leaf chlorophyll index of 'paluma' guava (Psidium guajava L.)
Our research aimed to evaluate the levels of leaf chlorophyll and gas exchange of guava cv
Summary
Guava (Psidium guajava L.) is a fruit of the Myrtaceae family, originally from South and Central America, and widely cultivated in Brazil, mainly in its semiarid portion. Despite being considered a plant tolerant to low fertility soils, to obtain high yields the nutritional needs of guava must be adequately provided, and the correct management of fertilization is essential (Corrêa et al, 2018). In this sense, besides supplying with inorganic. In melon (Cucumis melo L.) the use of bovine biofertilizer provided an increase of photosynthetic rates and transpiration, in addition to an adequate supply of K and N (Viana et al, 2013). The combined effects of nitrogen fertilization with bovine biofertilizer on the photosynthetic characteristics of guava cv. Paluma fertirrigated with liquid bovine biofertilizer and nitrogen in tropical semiarid conditions
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