Project Nitrogen – Measure It and Manage It


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One approach to help guide nitrogen (N) management decisions is the use of a nitrogen mass balance to determine fertiliser N requirements as a function of crop N demand and soil N supply However, measuring soil N is costly and time consuming, so alternative methods are required. The nitrate quick test has been used successfully both overseas and in New Zealand as a cost effective and sufficiently reliable proxy for soil mineral N supply. This SFF project is in its second year of three and looks at the usefulness of the Quick N test in potatoes and other vegetable crops.