Table 3.

Meteorological and agro-climatic conditions during April–July 2011 at the experimental site.

Meteorological parameters	April				May				June				July
	Mean (10 days)			Mean	Mean (10 days)			Mean	Mean (10 days)			Mean	Mean (10 days)			Mean
	I	II	III		I	II	III		I	II	III		I	II	III
Air temperature (°С)
Mean	7.3	8.5	12.7	9.5	17.1	17.8	21.8	19.0	22.4	24.7	25.6	24.3	29.5	28.5	31.7	29.9
Maх.	16.3	19.5	24.0	24.0	27.5	30.2	33.0	33.0	32.1	33.3	38.3	38.3	42.7	37.6	42.1	42.7
Min.	−4.4	1.0	−1.2	−4.4	8.4	6.4	9.9	6.4	12.0	13.4	13.2	12.0	19.6	17.4	16.8	16.8
Total amount of active temperature above 5 °С	27.0	34.5	76.6	138.1	120.9	128.4	184.5	433.8	173.3	197.7	205.9	576.5	244.8	235.2	244.6	724.6
Total amount of active temperature (°С)	2.0	3.0	33.9	38.9	70.9	78.4	86.2	235.5	129.5	123.3	147.4	400.2	194.8	185.2	238.4	618.4
Rainfall (mm)	4.0	2.4	–	6.4	5.1	1.0	4.7	10.8	0.3	4.0	3.2	7.5	–	–	–	–
Average relative humidity (%)	57	68	50	58	62	53	44	53	41	49	47	46	42	32	29	34
Min. relative humidity (%)	18	27	17	17	28	18	17	17	18	21	15	15	9	11	10	9
Soil surface temperature (°С)	−7	−2	−5	−7	7	5	8	5	9	11	19	13	21	22	25	22.7
Soil temperature in different depth (°С)
5 cm	6.5	8.5	14.7	9.9	19.5	21.1	25.2	22.1	27.3	28.6	29.8	28.6	30.7	31.3	31.9	31.3
10 cm	5.3	7.6	13.4	8.8	18.3	19.9	23.8	20.8	25.6	26.8	28.3	26.9	28.2	29.4	30.5	29.4
15 cm	4.5	7.2	12.6	8.1	17.7	19.3	23.2	20.1	25.0	26.6	27.0	26.2	27.2	27.3	28.4	27.6

I, II and III indicates 1st 10 days, 2nd 10 days and 3rd 10 days average data in every month.