Guayule - Irrigation Management

Abstract

Guayule (Parthenium argentatum) is a drought-tolerant shrub recognized for its potential as a sustainable source of natural rubber. Efficient water and nutrient management are crucial for maximizing guayule productivity for Bridgestone this be broader to include state growers in Arizona, particularly in arid and semi-arid regions. This study investigates the implementation of a drip irrigation system for guayule cultivation, incorporating clogging prevention methods and UAN32 (urea-ammonium nitrate) fertigation.The drip irrigation system design, including emitter selection, lateral spacing, and operating pressures, is optimized for guayule cultivation. Various clogging prevention strategies are evaluated, such as proper water filtration, periodic flushing, and the use of chemical treatments like acid injections. Additionally, the study explores the integration of UAN32 fertilizer through the drip irrigation system, allowing for targeted and efficient nutrient delivery. The results demonstrate that a well-designed drip irrigation system, coupled with effective clogging prevention techniques and UAN32 fertigation, can significantly improve water and nutrient use efficiency, leading to enhanced guayule growth and rubber yield. Specific clogging prevention methods, such as ion exchange process and acid injection, and physical methods like automated flushing valves, are found to be effective in maintaining system performance and longevity but are cost prohibitive for growers. The initial goal was to design a gravity fed system, however, given the water quality in the region, pressurized drip systems are required. The water in central Arizona has 500 to 760 ppm of TDS whereas the MCL is 500ppm.This study provides valuable insights for guayule growers and researchers, enabling them to implement sustainable and efficient irrigation and fertigation practices. It contributes to the successful cultivation of guayule as a viable alternative source of natural rubber while promoting water and nutrient conservation in arid and semi-arid regions.