However, the pre planting soil test for P of the experimental soil being relatively higher, an adjustment was made to the amount of P fertilizer added to 60% as suggested by Srinivasan (2010).
Pre-plant vegetation control Details of chemicals, rates, frequency and method of application.
The three trial sites all had different pre-plant sprays, for example; broadcast at McKinnon, spot mounding and spraying at Otaua, and ripping and mounding at Kawerau followed by pre-plant spray.
Herbicide tolerance allows for post-emergence application and in principle eliminates the need for pre-plant tillage and manual weeding.
Certification has not affected the type and quantities of herbicide used, per se, in pre-plant vegetation control operations.
However, this was applied at a rate equivalent to that recommended for killing mature broom plants and other scrub species during pre-plant site preparation (Young 2013).
Glyphosate, terbuthylazine and hexazinone were found to be the most widely used active ingredients in pre-plant (glyphosate) and post-plant (terbuthylazine and hexazinone) forest weed control operations.
All forest companies conducted pre-plant vegetation control, with the majority targeting this operation during late summer and autumn (between February and April).
Glyphosate was the most widely used active ingredient in pre-plant weed control with terbuthylazine and hexazinone used most widely for post-plant weed control.
HR crops make it possible to extend the glyphosate application window to most of the growing season, instead of just the pre-plant and post-harvest periods.
During April 2014, an operational pre-plant aerial spray (Rolando et al. 2013) was used to control weeds that had regenerated following harvest.
