Assessment of the quality and quantity of pointed cabbage grown under different farmyard manure treatments

Supervisors

Anton Nigten (aonigten@hotmail.com)
Egbert Lantinga (FSE Wageningen UR)

Purpose of the trial

Determination of the effects on growth, disease and pest susceptibility, and product quality of point cabbage grown under seven different treatments of farmyard manure. Six of the seven treatments have in common: enrichment of the farmyard manure with additives; cold composting of the farmyard manure, and dynamization of the (earth) minerals. The seventh treatment consists of farmyard manure only (zero treatment). We also want to know if the time interval between the spreading of farmyard manure and the planting date has influence on the susceptibility for pests and diseases.

The trial

The idea behind this trial is that the fresh mixture of animal manure and straw as such gives not a good soil fertility. The use of additives is necessary, and the nitrogen should be organically bound. Ammonium and ammonia can damage plant roots. Losses of carbon and nitrogen from the farmyard manure heaps must be avoided by the process of cold composting. The soil organisms need enough time to ‘digest’ the farmyard manures and the additives are necessary for the dynamization process.


Hypotheses

  • The different cold composted treatments with additives will give a better quality and quantity of point cabbage than the plot with only farmyard manure
  • The time interval between applying the farmyard manure and planting date will influence the susceptibility of the point cabbage for diseases and pests, and the product quality
  • There will be differences in nutrient mineralization pattern for the six treatments.