Effect of cultivar and soil acidity on the yield fertilizer relation and certain biochemical indices characterizing it in lettuce

Bubarova, M.; Atanasova, E.; V"lev P.; Ruskova, M.

Rasteniev'dni Nauki 24(10): 78-84


ISSN/ISBN: 0568-465X
Accession: 005229964

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The effect of fertilizer application and soil acidity on certain biochemical indices was investigated in three lettuce cultivars. Acid soil proved unfavourable for lettuce growing. The optimal fertilizer application level on neutral soil under conditions existing the experiment was 0.25 g salts per 100 g soil and relatively highest yield was produced by the new intensive cultivar Zhuta krasavitsa, a local selection. The biochemical indices vary in relation with the cultivar and the fertilizer rates. Higher fertilizer rates reduced sugar content and increased total nitrogen, nitrate, vitamin C and plastid pigment contents. The protein nitrogen:non protein nitrogen ratio was influenced more by cultivar differences than by the nutrient regime.