Resumen

O-QUEZADA, Guadalupe Alejandra de la et al. Biomass, proline and nitrogenous parameters in pecan seedlings under water stress and nitrogen fertilization. Rev. Chapingo Ser.Hortic [online]. 2011, vol.17, n.spe1, pp.13-18. ISSN 2007-4034.

This study was conducted to measure nitrogen concentration and response to water stress in pecan seedlings [Carya illinoinensis (Wangenh) C. Koch]. The experiment consisted in observation of growth and development of plants started from Western Schley pecan seeds. Seedlings were subjected to different treatments: irrigation with N supply, irrigation without N, water stress with N supply, and finally, and water stress without N. The following variables were assessed: plant height, trunk diameter, chlorophyll by SPAD and methanol, number of leaves and leaf area index, proline and biomass. The results showed that Western Schley pecan seedlings with N supply and water stress reduced the concentration of Nt and N-NO₃ by 21.73 % and 61.84 % respectively, leaf area and trunk diameter by 53.4 % and 36.5 %, respectively, but increased proline content by 39.41 %. With irrigation and in the absence of N, chlorophyll content decreased by 20 % and stem biomass by 58.34 %. Finally, the relative water content in stem and root decreased 61.54 % and 60.17%, respectively.

Palabras llave : Carya illinoensis; nitrates; chlorophyll; drought.