Articles
PRODUCTION OF LETTUCE UNDER DIFFERENT FERTILISATION TREATMENTS, YIELD AND QUALITY
Article number
571_6
Pages
65 – 72
Language
English
Abstract
Lettuce (Lactuca sativa) cultivars Gallega and Mantecosa were field grown, during autumn-winter, to study the effects of organic and inorganic fertilisers on the production and the contents of nitrates and vitamin C. Four fertiliser treatments were applied: two organic (vermicompost and biostabilised compost) and two inorganic ones (94% Ca (NO3)2 + 6% NH4NO3 and 74% Ca (NO3)2 + 6% NH4NO3 + 20% urea), and a control without any added fertiliser.
Yield, vitamin C, nitrate and dry matter were determined at commercial maturity stage.
Mantecosa presented significant differences for yield and nitrates content and no significant differences for dry matter and vitamin C among treatments.
The 74-6-20 and the vermicompost treatments resulted in the largest yield.
The 94-6 treatment showed the highest nitrate content; whereas the control and the biostabilised compost had lowest content of nitrate.
The mineral fertilised treatments had a lower level of vitamin C compared to organic treatments.
An opposite trend seemed to be valid for the nitrate concentration.
Gallega presented two groups with significant differences for nitrates.
The 94 -6 treatment presented the largest concentration and vermicompost the lowest.
Yield was only significant with regard to control, presented vermicompost and the 74-6-20 treatment the largest yields.
No significant differences were observed for vitamin C concentration.
Comparing the two cultivars Mantecosa presented a larger concentration of nitrates (2040 mg/kg FW). The vitamin C contents were high (23 and 19 mg/100g FW) in both cultivars.
Concerning the applied fertilisation, vermicompost presented the best result, i.e. a high yield, a low nitrate content and a high vitamin C content.
Yield, vitamin C, nitrate and dry matter were determined at commercial maturity stage.
Mantecosa presented significant differences for yield and nitrates content and no significant differences for dry matter and vitamin C among treatments.
The 74-6-20 and the vermicompost treatments resulted in the largest yield.
The 94-6 treatment showed the highest nitrate content; whereas the control and the biostabilised compost had lowest content of nitrate.
The mineral fertilised treatments had a lower level of vitamin C compared to organic treatments.
An opposite trend seemed to be valid for the nitrate concentration.
Gallega presented two groups with significant differences for nitrates.
The 94 -6 treatment presented the largest concentration and vermicompost the lowest.
Yield was only significant with regard to control, presented vermicompost and the 74-6-20 treatment the largest yields.
No significant differences were observed for vitamin C concentration.
Comparing the two cultivars Mantecosa presented a larger concentration of nitrates (2040 mg/kg FW). The vitamin C contents were high (23 and 19 mg/100g FW) in both cultivars.
Concerning the applied fertilisation, vermicompost presented the best result, i.e. a high yield, a low nitrate content and a high vitamin C content.
Authors
Z. Premuzic, A. Gárate, I. Bonilla
Keywords
Lactuca sativa, nitrate, nitrogen, compost, vermicompost, vitamin C
Online Articles (30)