Physiological attributes of jatropha under different planting densities and nitrogen doses

Revista Brasileira de Engenharia Agricola e Ambiental

Azevedo, Carlos A. V. de¹  Silva, Sonivagno S.¹  Nascimento, Ronaldo do¹  Lima, Rosiane L. S. de¹  Campos, Allan R. F.² 

[1] Universidade Federal de Campina Grande, Campina Grande, Brazil;Universidade Federal do Recôncavo da Bahia, Cruz das Almas, Brazil

关键词: Jatropha curcas;    gas exchange;    nitrogen fertilizer;    water use efficiency.;   

DOI  :  10.1590/1807-1929/agriambi.v20n12p1112-1117

学科分类：农业科学（综合）

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

【 摘 要 】

Nitrogen (N) fertilization associated with planting density is a practice that can improve the physiological aspects and consequently increase the yield of a crop. Thus, this study aimed to evaluate the effects of planting density and N levels on the physiological aspects of jatropha in the ‘Agreste’ region of Paraíba. Treatments consisted of four planting densities (833, 1,111, 1,666 and 2,500 plants ha-1) representing the plots and five N doses (0, 40, 80, 120 and 180 kg ha-1) corresponding the subplots. The effects of treatments on CO2 assimilation rate, internal CO2 concentration, transpiration, stomatal conductance, water use efficiency, instantaneous carboxylation efficiency and SPAD index were analysed. Except for stomatal conductance, the other variables were influenced by the interaction between planting densities and N levels. The association of the dose of 80 kg ha-1 with a planting density of 2,200 plants ha-1 provided adequate conditions for the production of plants with increased photosynthetic activity and efficient use of water.

【 授权许可】

CC BY