1a.Objectives (from AD-416):
Determine real time seasonal N requirements of drip irrigated pomegranates. Determine the effect of three nitrogen injection rates on the N leaching loss.
1b.Approach (from AD-416):
A field experiment will be conducted on 3.3 acres of land with 3 levels of N injection with surface and subsurface. The effects on tree development and fruit quality will be measured.
This project supports objective 2 of the parent project. This is the second year of a project to evaluate the fertilizer requirements for a developing pomegranate crop. This Specific Cooperative Agreement (SCA) was created to allow the operation of the project on the Kearney Agricultural Center property containing a large weighing lysimeter that measures crop water use. Since fertilizer is being injected through the irrigation system, it is necessary to eliminate water stress as a potential variable in the plant development and accurate measurement of crop water requirement is necessary. The daily crop water use as measured by the lysimeter was fully met with each irrigation on all fertilizer treatments. Studies of the soil nitrate distribution determined nitrate was relatively uniformly distributed throughout the field both laterally and vertically. The university cooperator is also a project team member and supervises the agronomic portions of the study. The UC farm staff has provided weed control and support in filling trenches and leveling the site following the installation of the new subsurface drip irrigation system.