Evaluation of Irrigation Practices for Growth, Biomass Production, and Nutrient Partitioning in Eucalyptus camaldulensis Plants in Indian Dry Zone

Abstract

Supplemental irrigation is essential to increase tree productivity in dry areas to fulfill the local needs. One-year-old Eucalyptus camaldulensis Dehnh plants were planted in July 1998 and supplemental irrigation was provided at 36.2 mm (I₁), 26.5 mm (I₂), 20.2 mm (I₃), 18.1 mm (I₄), and live saving (I₅). Frequency and quantity of irrigation increased with an increase in irrigation level enhancing plant height, collar diameter, and biomass. These variables were highest at I₁, but water use efficiency (WUE) was highest at I₂. Dry biomass production increased from 1.18 kg plant⁻¹ at I₅ to 13.75 kg plant⁻¹ at I₁ at 24-month age. Biomass allocation to root increased from I₁ to I₅ but it was at the expense of leaf and branches. Height, collar diameter, dry biomass, and nutrient uptake indicated a non-linear increase with total quantity of water. Partitioning of N, Mg, Fe, Mn, Cu, and Zn was greater to stem; and those of P, K, and Ca was greater to leaf than to the other parts. Conclusively, I₃ and I₄ levels supported establishment whereas I₂ level was best for growth and productivity of E. camaldulensis plants in dry areas. The I₁ level could be tried to increase water use and reduce salinity buildup.

Keywords:

• dry biomass
• desert
• leaf growth
• nutrient uptake
• soil water content
• water use efficiency

Acknowledgments

The author is thankful to the Director of the Arid Forest Research Institute for providing the necessary facilities. Technical assistance by Sh. T. R. Rathod, R.A. I is gratefully acknowledged.