Water salinity, nitrogen and phosphorus on photochemical efficiency and growth of west indian cherry

Revista Brasileira de Engenharia Agricola e Ambiental

Paiva, Emanoela P. de¹  Sá, Francisco V. da S.²  Moreira, Rômulo C. L.²  Silva, Luderlândio de A.²  Lima, Geovani S. de²  Gheyi, Hans R.³ 

[1]Universidade Federal Rural do Semi-Árido, Mossoró, Brazil

[2]Universidade Federal de Campina Grande, Campina Grande, Brazil

[3]Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Brazil

关键词: chlorophyll fluorescence;    saline stress;    fertilization;    Malphigia emarginata.;   

DOI  :  10.1590/1807-1929/agriambi.v22n3p158-163

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

The objective of this study was to evaluate the interaction between water salinity and doses of nitrogen and phosphorus on chlorophyll a fluorescence and on the growth of West Indian Cherry (‘acerola’) plants in the initial growth stage. The research was carried out in a protected environment, in lysimeters filled with Regolithic Neosol of loamy clay texture and low initial phosphorus content. The experiment was conducted in a randomized block design, arranged in a factorial scheme with two factors, five levels of electrical conductivity of the irrigation water - ECw (0.6, 1.4, 2.2, 3.0 and 3.8 dS m-1) and four proportions of the recommendation of phosphorus/nitrogen - P/N (100:100, 140:100, 100:140 and 140:140% P/N of recommendation), with three replicates, and each plot consisted of one plant. Water salinity above 2.2 dS m-1 decreases the quantum efficiency of photosystem II and the growth of west indian cherry plants. Increase in nitrogen and/or phosphorus supply improves the energy stability of west indian cherry plants by reducing the effects of salt stress on the quantum efficiency of photosystem II. The increase of 40% in the nitrogen dose increased the chlorophyll a fluorescence, but did not influence the plant growth.

【 授权许可】

CC BY