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Efeitos da adubação potássica e irrigação com águas salinas no crescimento de porta-enxerto de goiabeira

2018; Sociedade de Ciências Agrárias de Portugal; Volume: 41; Issue: 4 Linguagem: Inglês

10.19084/rca18119

2183-041X

Benedito Ferreira Bonifácio, Reginaldo Gomes Nobre, Anielson Dos Santos Sousa, Everaldo Mariano Gomes, Evandro Manoel da Silva, Leandro Pacheco de Sousa,

Plant Disease Management Techniques

The objective of this work was to evaluate the effects of different irrigation water salinities on the growth of guava rootstock cv. Paluma fertilized with increasing doses of potassium, in an experiment conducted under greenhouse conditions of the CCTA / UFCG municipality of Pombal - PB. The experimental design was a randomized complete block design in a 5 x 4 factorial scheme, whose treatments resulted from the combination of five levels of electrical conductivity of the irrigation water (ECw = 0.3, 1.1, 1.9, 2.7 and 3.5 dS m-1) and four doses of potassium (70, 100, 130 and 160% K), the dose corresponding to 100% K corresponding to 726 mg K dm-3 substrate, with four replicates and two plants per plot, no border. The increase of salinity of the irrigation water reduces the growth of guava rootstock cv. Paluma, the most deleterious effects being at levels above 1.9 dS m-1; increasing doses of K up to 1161.6 mg K dm-3 substrate did not attenuate the harmful effects of the salts, nor did they exert any difference on the growth of most of the variables of guava rootstock cv. Paluma at 120 and 225 days after the emergency.