Marketable and nutritional quality of leeks as affected by water and nitrogen supply and plant age at Harvest

Marketable and nutritional quality of leeks as affected by water and nitrogen supply and plant... The marketable and nutritional quality of leeks as affected by nitrogen fertilisation, water supply, and plant age at harvest was investigated during 1991 and 1992. The yield of marketable leeks increased with increasing nitrogen supply, although only small differences were observed between 160 and 280 kg total N ha−1. The total nitrogen supply includes soil mineral nitrogen within the 0–50 cm depth. The yield was lower when leeks were grown with less frequent irrigation, ie irrigation at a soil water potential of −0.09 MPa at 20 cm depth. On average, the yield of leeks increased until harvest in the middle of October, 200 days after sowing. The concentration of nitrate increased and the concentrations of dry matter and potassium decreased with increased nitrogen supply. Leeks grown with less frequent irrigation showed increased concentrations of dietary fibre, vitamin C, nitrate, protein, calcium, magnesium, and manganese. The nutritional quality of leeks improved with increased plant age at harvest because the concentration of potassium increased and the concentration of nitrate decreased. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Science of Food and Agriculture Wiley

Marketable and nutritional quality of leeks as affected by water and nitrogen supply and plant age at Harvest

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Publisher
Wiley
Copyright
Copyright © 1995 John Wiley & Sons, Ltd
ISSN
0022-5142
eISSN
1097-0010
D.O.I.
10.1002/jsfa.2740680316
Publisher site
See Article on Publisher Site

Abstract

The marketable and nutritional quality of leeks as affected by nitrogen fertilisation, water supply, and plant age at harvest was investigated during 1991 and 1992. The yield of marketable leeks increased with increasing nitrogen supply, although only small differences were observed between 160 and 280 kg total N ha−1. The total nitrogen supply includes soil mineral nitrogen within the 0–50 cm depth. The yield was lower when leeks were grown with less frequent irrigation, ie irrigation at a soil water potential of −0.09 MPa at 20 cm depth. On average, the yield of leeks increased until harvest in the middle of October, 200 days after sowing. The concentration of nitrate increased and the concentrations of dry matter and potassium decreased with increased nitrogen supply. Leeks grown with less frequent irrigation showed increased concentrations of dietary fibre, vitamin C, nitrate, protein, calcium, magnesium, and manganese. The nutritional quality of leeks improved with increased plant age at harvest because the concentration of potassium increased and the concentration of nitrate decreased.

Journal

Journal of the Science of Food and AgricultureWiley

Published: Jul 1, 1995

References

  • Determination of ammonium in Kjeldahl digest of crops by an automated procedure
    Crooke, Crooke; Simpson, Simpson
  • Effect of nitrogen nutrition and water regime on abscisic, phaseic and dihydrophaseic acid metabolism in leaves of field‐grown kale (. Brassica oleracea): Consequences for plant growth and crop yield
    Whenham, Whenham; Burns, Burns; Stone, Stone; Fraser, Fraser

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