Abstract
The nitrogen effect of ligno Carex peat addition to heavy clay with a low content of organic matter was investigated in a pot experiment of eight years. The test plant was oats. The nitrogen effect proved to be very small. It was evident that the positive effect of an addition of peat to mineral soil, which in some cases can be very marked in field conditions, is mainly physical. Primarily it may be due to improved soil moisture conditions.
Highlights
It is common knowledge that the addition of suitable organic matter may promote plant growth especially in soil with a low humus content
In order to get experimental results concerning the nitrogen effect of peat, a pot experiment was started in autumn 1964
The effect of nitrogen fertilization shows that the experimental soil was suitable for the purpose
Summary
It is common knowledge that the addition of suitable organic matter may promote plant growth especially in soil with a low humus content. The most valuable of these humus fertilizers is farmyard manure, which contains plant nutrients as well as organic matter. It has not been clearly defined to what extent the plant growth promoting effect of faimyard manure is dependent on organic matter or on plant nutrients. It is almost impossible to separate the physical effect and the possible plant nutrient effect of humus fertilizing in field experiments. In a pot experiment it is possible to obtain reasonably precise knowledge of the plant nutrient effect because in an open air pot experiment the water supply can be arranged near to optimum
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