The effect of different nitrogen doses on yielding and nutritive value of chinese cabbage
2007
Kalisz, A.,Akademia Rolnicza, Krakow (Poland). Katedra Warzywnictwa z Ekonomika Ogrodnictwa
This study was carried out in the years 2003-2005 on the effect of different nitrogen fertilization on the yield and chemical composition of field-grown Chinese cabbage produced for autumn harvests. All experimental plots were initially fertilized with 100 kg N/ha before transplanting. Additionally, the following doses of nitrogen were applied during vegetation period: 20, 60, and 100 kg N/ha. The lowest total yield was obtained at the lowest tested nitrogen dose of 20 kg N/ha. The results demonstrated that increasing nitrogen rates increased the marketable yield on average by 5.16 t/ha (60 kg N/ha) and 5.49 t/ha (100 kg N/ha) in comparison to 20 kg N/ha. However, the number of Chinese cabbage plants suitable for trading and the average weight of marketable heads were statistically similar. The highest content of dry weight and L-ascorbic acid was noted in Chinese cabbage fertilized with 60 kg N/ha (4.45 percent f.w. and 20.27 mg/100 g f.w., respectively). It was also observed that the nitrogen dose of 100 kg N/ha caused the highest accumulation of thiocyanates (23.76 mcg KSCN/g f.w.). The nitrates and total N accumulation in Chinese cabbage continuously increased with N rate - from 1454.7 mg NO3/kg f.w. and 2.93 percent d.w. (20 kg N/ha) to 1784.5 mg NO3 /ˇkg f.w. and 3.22 percent d.w. (100 kg N/ha). The soluble sugar and crude fiber content was not significantly influenced by nitrogen fertilization
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