Nutrient Management Research Database

http://vric.ucdavis.edu/pdf/fertilization_EfficientNitrogenManagementforCoolSeasonvegetable2007.pdf

• This guide outlines the research performed since 1990 on efficient N management practices in California cool-season vegetable production.
• The techniques covered in this guide are cost-effective, and allow for maintained crop yield and quality while reducing detrimental environmental impacts from N fertilization.
• Fertilizer N can pollute groundwater and stimulate algal growth in water bodies.

• This guide has sections covering:

1) A background on current N usage and related environmental consequences.

2) The different forms of soil N, their relevance to crop N needs, and patterns in crop N demand through the course of a growing season.

3) The influence of irrigation on soil N.

• Practical recommendations are made regarding:

1) Developing crop specific N fertilization templates.

2) Modifying nutrient plans for field-specific conditions.

3) Monitoring soil and crop N status.

• This guide also includes an appendix with instructions on conducting “quick test” for in-season nitrate testing as well as petiole nitrate determination for a variety of vegetable crops.