Productivity of crop rotation using fertilizers and herbicides in the Vologda Oblast

Open Access

Table 1.

Balance coefficients of nutrient use in crop rotation, on average over the years of research

Indicator	Element	Variant
		2		3		4		5
		1	2	1	2	1	2	1	2
Weighted average annual removal by cultivated plants [kg/ha]	N	68.5	73.3	92.1	96.8	105.9	110.3	101.4	106.2
	P₂O₅	25.4	27.3	32.2	34.3	37.9	37.9	37.4	37.4
	K₂O	82.6	84.4	109.5	113.1	122.5	126.3	116.9	123.8
Weighted average annual removal by cultivated and weed plants [kg/ha]	N	84.4	76.9	110.5	101.9	126.8	115.8	120.4	112
	P₂O₅	29.8	28.4	37.3	35.6	39.4	39.4	38.7	38.7
	K₂O	105.4	88.7	137.1	120.5	149.2	134.1	143.7	131.1
Average annual fertilizer application [kg/ha]	N	14	14	93	93	138	138	93	93
	P₂O₅	17	17	41	41	41	41	41	41
	K₂O	12	12	90	90	90	90	90	90
Kb actual disregarding weed plants [%]	N	506	527	99	104	77	80	109	113
	P₂O₅	149	161	77	82	88	91	88	90
	K₂O	327	313	119	121	134	136	124	132
Kb actual taking into account weed plants [%]	N	–	–	119	110	92	84	129	120
	P₂O₅	–	–	91	87	96	96	94	94
	K₂O	–	–	152	134	166	149	160	146

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