MINERAL NUTRITION AND POTATOES EFFICIENCY IN CONDITIONS OF RNO–ALANIA - Ecological Consequences of Increasing Crop Productivity - page 50

TABLE 6.1 Influence of mineral nutrition on phases of potato plant growth (days after
planting) 2012-2013

Phase of growth and development

Experience variants

Sprout emer-
gence

Budding Flowering Wilting

Volzhanin

Control (without fertilizers) 21 39 48 100

N 32 P 32 K 32 21 42 52 102

N 48 P 48 K 48 21 45 53 103

N 64 P 64 K 64

21 48 55 109

Udacha

Control (without fertilizers) 19 36 45 96

N 32 P 32 K 32 19 38 47 98

N 48 P 48 K 48 19 39 47 98

N 64 P 64 K 64 19 41 51 100

Bars

Control (without fertilizers) 22 38 47 98

N 32 P 32 K 32 22 41 50 100

N 48 P 48 K 48 22 43 51 102

N 64 P 64 K 64 22 46 53 106

Weather conditions of the second year had a more favorable impact on sprout
emergence. Therefore, in 2013, we noted that the early ripening variety Uducha
emerged 3 days earlier than the variety Bars and 2 days earlier than Volzhanin. Sprout
emergence did not depend on the level of mineral nutrition, but this is not true for sub-
sequent growth phases and interphase periods. Thus, with a rise in the dose of mineral
nutrition, interphase periods, and number of days of sprout emergence was increased
compared to the next phase. With increasing dosage rate of fertilizer the interphase pe-
riods increased as well. For example, in the variant with maximum nutrition level the
phase of full dying off came at 109, 100, and 106 days, and this means that varieties
shifted from the early-ripening to middle-early and mid-ripening group.
The bush of potato plant consists of several rather autonomous stalks, the quantity
of which is a varietal feature. As a rule, between a number of stalks and formed tubers,
there is a positive dependence; however, a direct link is often lacking and generally
this sign (stalk quantity) is classifi ed as the varietal features [2, 8].