Effects of forms and rates of organic and inorganic nitrogen fertilisers on the yield and some quality indices of tomatoes (Lycopersicon esculentumMiller)
作者:
K.D. Montagu,
K.M. Goh,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1990)
卷期:
Volume 18,
issue 1
页码: 31-37
ISSN:0114-0671
年代: 1990
DOI:10.1080/01140671.1990.10428067
出版商: Taylor & Francis Group
关键词: nitrogen fertilisers;organic;inorganic;tomato yield;quality indices;vitamin C;fruit size;colour
数据来源: Taylor
摘要:
The effects of two organic (blood and bone, compost) and two inorganic (potassium nitrate, KNO3; ammonium sulphate, (NH4)2SO4) forms of nitrogen (N) fertilisers on the yield and some quality indices of tomatoes were studied in a pot experiment using Waimairi peaty loam soil obtained from an area currently used for vegetable production. Four rates (0,150, 300, 600 kg N/ha, based on soil bulk density) of each fertiliser form were used. Fruit yield was significantly correlated with foliage N concentration, but not with fruit N concentration. Increasing rates of all N fertilisers, except compost, produced significant increases in fruit yield. Compared with the control, at 600 kg N/ha applied, compost increased fruit yield by 40% only whereas the other N fertilisers studied increased fruit yield by 120%. Fruit quality indices measured showed variable response to treatments. Fruit colour increased significantly on application of blood and bone, (NH4)2SO4, and KNO3, whereas compost showed no effect. Fruit vitamin C concentrations decreased when all N fertilisers were applied. Increasing N rate produced significant negative linear trends with vitamin C concentration decreasing by 18–28% depending on the form applied. Fruit size was unaffected by treatments but visual quality of fruit decreased when N in any form was applied.
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