Crescimento, produtividade e nível crítico de fósforo para o quiabeiro em relação à adubação fosfatada

Abstract

RESUMO Growth, yield and phosphorus critical level for okra in relation to phosphate fertilization ABSTRACTThe study aimed to evaluate the growth, productivity attributes and soil P critical level, for okra cultivar, Clemson Spineless, regarding phosphorus fertilization at the seeding. The research was conducted under field conditions, in the Zona da Mata of Pernambuco state, Brazil. The experimental design was a randomized block with six replications. Treatments consisted of doses 0, 8, 16, 32, 65, 130 and 260 kg P 2 O 5 ha -1 . Was evaluated growth, fruit yield, number of fruits per plant and fruit weight. At the end of the growth cycle, was determined critical P level in soil. The plant height and stem diameter adjusted to the sigmoid model, with difference in phosphorus fertilization, in which it was found that application of 130 kg P 2 O 5 ha -1 provided greater plant growth, with values of 123.1 cm and 17.7 mm, respectively. The phosphorus provided increments in productivity attributes, being observed with the addition of 130 kg P 2 O 5 ha -1 , gains of 3.44 Mg ha -1 of fruit, 3.33 fruits per plant. The P availability in soil increased with phosphate fertilization, which made it possible to determine the critical level in 79 mg dm -3 .

Yield and physical-chemical quality of okra fruits irrigated with brackish water and phosphorus fertilization

“…The results are consistent with those obtained by Oliveira et al (2013), who studied the okra cv. Clemson Spineless 80; they observed an increase in fruit diameter with increased phosphorus fertilization.…”

“…The results showed that the dose of 80 kg/ha of phosphorus provided the maximum productivity values, while the treatment without phosphorus fertilization showed minimum productivity values. Oliveira et al (2013), working with the Clemson Spineless 80 cv., also found positive effects of P on increasing okra yield.…”

Phosphate fertilization and critical leaf phosphorus content for okra

“…The maximum length (17.3 cm) and number of fruits (26.6 fruits plant -1 ) were estimated at the dose of 80 kg ha -1 P 2 O 5 . The increase in the number of fruits per plant as a function of the increase in the P dose has also been observed by Oliveira et al (2007), Firoz (2009), Oliveira et al (2013) and Uddin et al (2014). Regarding the absence of phosphate mineral fertilizer at planting, there were increases of 4.8 and 37.1% in length and number of fruits, respectively, at the optimal dose of P.…”

“…For example, Matos et al (2020) evaluated okra yield as a function of cattle manure doses. For the conditions of the Northeast, there are studies evaluating phosphate fertilization (OLIVEIRA et al, 2013;SANTOS et al, 2019), nitrogen and potassium fertilization (SANTOS et al, 2019), and organomineral fertilization (OLIVEIRA et al, 2014;SANTOS et al, 2019;SALES et al, 2020;SALES et al, 2021).…”