Abstract
The studies were conducted to identify the influence of the timing of litter manure application in conjunction with mineral fertilizers and planting density on the duration of potato development phases and plant height. The experiments were laid by a systematic method with a tiered arrangement of variants in the experiment, the repetition is 3-fold. Research methods: descriptive method and methods of field experiments. Phenological observations in experiments have shown that the doses of mineral fertilizers and the timing of manure application have some effect on the phases of potato plant development and plant growth. The lowest plants were obtained in variants without manure application and its application in winter on snow. The tallest plants are noted when applying manure under the chill and during spring application. This work is of practical importance for the cultivation of potatoes on dark chestnut soils of the Republic of Kazakhstan under irrigation with the use of optimal doses of mineral fertilizers and manure.