THE EFFECT OF INTENSIVE ORGANO – MINERAL FERTILIZATION ON THE YIELD OF GREENHOUSE CUCUMBERS AND THE MINERALIZATION OF NITROGEN – CONTAINING ORGANIC COMPOUNDS IN SOIL

The effect of nutrition with nitrogen at 0, 200, 400, 600 and 800 kg/ha against the background of P₂₀₀K₂₀₀ and a manure nutritional level of 50, 100, and 200 t/ha, on the vegetative and reproduction behavior of the plants of cv.
Sandra and on the process of ammonifying, was studied during the period 1988 – 1990 in non-heated plastic houses.

It has been established that increasing the nitrogen level up to 600 kg/decare increases the cucumber yield.
This is best expressed at a nutrition level of 50 t/ha and the poorest expression is at 200 t/ha.

The highest yield – 112 350 kg/ha, has been achieved when fertilizing with N₆₀₀P₂₀₀K₂₀₀ + 150 t of manure per ha, the yield increases in comparison with the fertilization with N₂₀₀P₂₀₀K₂₀₀ + 50 t of manure (the control), being 73.90%.

Increasing the nitrogen level up to 600 kg/ha increases the development of ammonifying bacteria, as well as the potential ammonifying and urease activities, and decreases the protease activity of soil.

I Balkan Symposium On Vegetables and Potatoes

N. Alexiev, V. Rankov

cucumbers, fertilization, nitrogen, phosphorus, potassium, organic compounds, mineralization

https://doi.org/10.17660/ActaHortic.1997.462.31