HIGHLIGHTS:
Nematode-tolerant rootstock increases the efficiency of irrigated guava cultivation in the Brazilian semi-arid region.
The use of ‘BRS Guaraçá’ rootstock is feasible mainly in the second half of the year for the Brazilian semi-arid region.
Irrigation depth of 120% ETc increases the production of ‘Paluma’ guava with ‘BRS Guaraçá’ rootstock.
ABSTRACT
Using nematode-resistant and/or -tolerant rootstock is a strategy that has maintained guava cultivation feasible in the irrigated perimeters of the Brazilian semi-arid region. The objective was to evaluate the production, gas exchange, and fruit quality of ‘Paluma’ guava with and without nematode-tolerant rootstock under different irrigation depths and production periods. The experimental design was randomized blocks, in the mixed 2 × 4 × 2 factorial scheme, corresponding to two forms of cultivation of ‘Paluma’ guava (without and with nematode-tolerant rootstock), four irrigation depths (60, 80, 100, and 120% of crop evapotranspiration - ETc), and two production periods, with four replicates. Guava plants were evaluated for physiological, production and post-harvest quality parameters. Gas exchange in ‘Paluma’ guava leaves was higher in the second production cycle, under irrigation depths above 100% ETc, not differing with the use of the rootstock. The use of the rootstock ‘BRS Guaraçá’ promotes a greater number of fruits and production with the increase of the irrigation depth, mainly in the second half of the year, with the increase of soluble solids and titratable acidity in the fruits.
Key words:
Psidium guajava L.; evapotranspiration; production; post-harvest; gas exchange
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* - Significant at 0.05 probability level; ** - Significant at 0.01 probability level
* - Significant at 0.05 probability level; ** - Significant at 0.01 probability level; ns - non-significant at 0.05 probability level. Different lowercase letters indicate difference between forms of cultivation. Different uppercase letters indicate difference between production cycles. 1st H - 1st half, 2nd H - 2nd half. RST - rootstock
* - Significant at 0.05 probability level. ** - Significant at 0.01 probability level. Different lowercase letters indicate difference between forms of cultivation. Different uppercase letters indicate difference between production cycles. 1st H - 1st half, 2nd H - 2nd half. RST - rootstock
* - Significant at 0.05 probability level. ** - Significant at 0.01 probability level. Different lowercase letters indicate difference between forms of cultivation. Different uppercase letters indicate difference between production cycles. 1st H - 1st half, 2nd H - 2nd half. RST - rootstock
Different lowercase letters indicate difference between forms of cultivation. Different uppercase letters indicate difference between production cycles