Abstract

NUNEZ COLIMA, Juan Antonio et al. Influence of climatic variables in N content in Carya illinoensis Koch. Nova scientia [online]. 2019, vol.11, n.22, pp.207-223. ISSN 2007-0705.  https://doi.org/10.21640/ns.v11i22.1823.

In the Comarca Lagunera the area estimated of pecan (Carya illinoensis) is 9,208 ha-1, with an approximate yield of 1, 459 t of pecan ha-1. Varieties predominants in the Comarca Lagunera are Wichita and Western. When the demand for nutrients in the plants cannot be covered, they depend directly on the stored compounds. One of the most demanding nutrients by plants for their growth and development is nitrogen (N), the lack of this nutritive element can lead to low growth. It´s necessary to know the influence of climate variables (temperature, irradiation and relative humidity) on nitrogen percentage stored in the biomass of two varieties cultivated in the study area (Western and Wichita) in order to contribute to agronomical management. The objective of this research was to observe the variation of the N content in the trunk and to develop a mathematical function that describes its behavior from the environmental variables (temperature, relative humidity, and irradiation). The study was conducted in the experimental field of the Universidad Agraria Antonio Narro Unidad Laguna. Four trees of approximately 30 years of each variety were selected. Cores were extracted monthly for one year (July 2016 to June 2017). The content of total N was determined through gas analyzer, the biomass was estimated by through of allometric equations. An analysis of variance of two factors (month and variety) was performed to observe the difference between the N percentage in the trunk in the different months. The relationship of the environmental variables with the N percentage in the trunk was determined through multiple linear regression. The percentage of N was not affected by the factors (month and variety). The average monthly temperature was the variable that most affected the total N content in the trunk of the tree, in comparison with the relative humidity and irradiation. No significant difference was found between the sampling months and the varieties (Western and Wichita). The prediction of the percentage of N is less precise due to the size of the trunk of the tree. Pecan tends to increase the N percentage when low temperatures are recorded. The stored compounds can fluctuate at any time due to their plasticity.

Keywords : Carya; pecan; N; irradiation; temperature.

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