Conservation Damage: ‘Aerial Operators WARNED’

Conservation Damage: ‘Aerial Operators WARNED’

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Krenite — a non-hormone plant growth regulator that was developed by Du Pont, an American chemical company.

A suppression of many ‘woody’ species is the outcome of the herbicide, using water-scluble liquid diluted with water. Application of the agent is used as a foliar spray.

Fear, ignorant and dangerous. Herbicides like Krenite among many, which affect the soil from thriving is an outcome and price to pay.


A wide range of soil types used for cropping in New Zealand often makes herbicide behaviour more difficult to predict in specific situations.

Factors that affect herbicide activity in soil may bring potential problems.

Molecules in the soil can be attracted to the surface of organic matter, including clay particles, where it is more tight or absorbed. The herbicide is not as prominently available for plants to uptake than if it were to move freely in the soil water.

Absorption may vary in certain aspects by soil, where for example, a powerful absorption could mean plant uptake would have a worse outcome. TCA doesn’t absorb as much but remains mainly in the soil water.

Many herbicides commonly between eighty and ninety per cent of the chemicals are absorbed in most agricultural soils at normal field conditions where it is moisturised.

Stronger absorptions of herbicides attach onto the soil organic matter. Higher organic matter contents would show less activity in organic soils than in mineral soils.

Herbicides can be more active in light sandy soils than in heavy clay soils with the same organic matter contents.

The decreasing of herbicide concentration in the soil, adsorption affects not only the activity of the chemical in the soil but also its response to some other processes.

Before any type of herbicide can be leached, it must first be dissolved in draining water.

Less soluble herbicides require larger amounts of water, roughly 2.4 millimetres of rain would dissolve 1 kilogram of diuron per hectare. 80 millimetres is necessary to dissolve the same amount of simazine.

Moving water can carry only that part of the herbicide which is freely dissolved, where and when it is released, the material will be released into the water.

The spread of downward movement is greatly reduced. For example, if eighty per cent were to adsorb, the movement of chemicals downward would be only one-fifth as fast as the flow of water itself.


It is said that herbicide is ‘rarely’ and ‘unlikely’ to leach out of root zones of crops, except on light sandy soils with little-to-no organic matter attached. However, excessive leaching can potentially carry herbicides from the surface deep enough into the soil to be picked up by roots of crops.


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