The use of natural resources and reproduction of soil fertility in obtaining a given quantity of products

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Table 2.

Nitrogen and phosphorus balance in the experiment, kg per 1 ha in a year.

Crop rotation	Mineral elements	Removal with the commodity part of theharvest	Fertilized^*	Balance
I a	N	66.8	6.0	‐60.8
I a	P₂O₅	30.9	3.0	‐27.9
I b	N	101.0	49.0	‐52.0
I b	P₂O₅	37.0	43.0	6.0
II a	N	66.6	16.1	‐50.5
II a	P₂O₅	28.3	9.3	‐19.0
II b	N	100.2	60.7	‐39.5
II b	P₂O₅	32.7	49.7	17.0
III a	N	48.4	6.0	‐37.4
III a	P₂O₅	26.5	3.0	‐23.5
III b	N	80.3	49.0	‐31.3
III b	P₂O₅	29.8	43.0	13.2

Note: including the weight of green manure crop: a represents 6 tons of manure; b represents 12 tons of manure + N₃₇P₃₇K₃₇ per 1 ha of crop rotation; I represents cereal-fallow-row crop rotation; II represents green manuring crop rotation; III represents field crop rotation.

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