Effect of cultivation method on the yield and biological quality of garden crops, and on the microbiological processes in soil
1998
Jaervan, M. | Laitamm, H.
The yields and biochemical composition of potato and vegetables were compared in trial areas fertilized with plant compost and mineral fertilizers. Equivalent rates of NPK were applied to the trial areas during three years (1995-1997). With compost the potato yield was 33-35 per cent less than with mineral fertilizers. Potato fertilized with compost contained less nitrates and more vitamin C. In 1996 the carrot yield was on average 24 per cent less with compost than with mineral fertilizers. In the trial conditions of 1997, the yields of both carrot varieties were lower in the variant with mineral fertilizers than thatwith compost. The negative effect of mineral fertilizer was probably due to a too high rate of mineral nitrogen, as carrot is a crop that germinates slowly and does not tolerate high concentration of plant nutrients, but also due to a lasting drought. After harvesting the number of different groups of micro-organisms in soil differed depending on soil properties, crop and fertilization
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