Beetroot (beta Vulgaris L.) Growth and Response to N Supply – a Case Study
New Zealand journal of crop and horticultural science(2020)
摘要
There is need for information on the general crop physiology and nitrogen (N) fertiliser responses of beetroot in New Zealand. We investigated the responses to N of beetroot grown in a silt loam near Hastings, Hawke's Bay. Four fertiliser treatments (0, 160, 320 or 480 kg N ha(-1)) were applied as urea, split evenly over four application times. The canopy light extinction coefficient averaged 0.64. Radiation use efficiency averaged 1.05 g MJ(-1)for the treatments that received N fertiliser. Maximum yield occurred at an N fertiliser rate around 320 kg N ha(-1). Published recommendations suggest only 225 kg N ha(-1)would have been needed. This underestimation would have led to a yield penalty of only about 6%, but decreased the risk of significant mineral being N left in the soil. We discuss approaches to account for N supply from the soil when forecasting residual mineral N and N leaching risk.
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关键词
Fertiliser,soil N,critical nutrient concentration,leaf area,light interception,red beet,residual mineral N
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