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The effects of potassium sulfate, potassium chloride and proper potassium deduction amount on potato growth, yield, economic benefit and potassium utilization rate were studied by the randomized block design to provide the theoretical basis for high-yield cultivation and efficient potassium utilization in potato production in single cropping region of Guizhou. Results: The potato yield is no significant difference between potassium sulfate and potassium chloride under the same potassium amount.The potassium fertilizer application amount in yellow soil with a high fertility can be decreased by 10 %.Potassium sulfate is suitably used as topdressing by stages but potassium chloride is suitably used as basal application and topdressing by stages.The input-output ratio of potato planted in yellow soil with a lower soil fertility reaches 3.79 under applying potassium chloride based on the application amount of the convention potassium( 150 K2 O kg/hm2). The agronomic efficiency, physiological efficiency and current utilization efficiency of potassium fertilizer in soils with lower and higher fertility is up to 25.98- 33.34, 46.80- 78.85 kg/kg and 41.74 %- 56.70 %, separately. [ABSTRACT FROM AUTHOR]

Effects of potassium fertilizing amount (0, 60, 120, 240, 360 k/hm2) on potato dry matter accumulation, potassium absorption and utilization efficiency were studied to provide a scientific reference for potassium management in high-yield cultivation of potato. Results: (i) The accumulation amount of dry matter and potassium increased with potato growing. The dynamic changes could be fitted with Logistic equation. (ii) Compared with the treatment without applying potassium fertilizer, optimum potassium fertilizer (120, 240, 360 kg/hm2) could significantly enhance the accumulation amounts of dry matter and potassium 60 days after seedling emergence, while decreased 70 days later, which was still higher than the treatment without applying potassium fertilizer. (iii) Applying potassium fertilizer delayed the occurrence time of maximum accumulation rates of dry matter and potassium. And the higher the later. (iv) When potassium fertilizing amount was 120 kg/hm2，the yield reached 35 269 kg/hm2，and the agronomic efficiency and utilization rate were significantly higher than high-potassium treatments (240, 360 kg/hm2). [ABSTRACT FROM AUTHOR]

To explore the effects of the distribution of biological organic fertilizer on the soil quick nutrients, nutrient yield, yield and quality. Using taro No. 5, on the basis of reducing 25% slow-release fertilizer, different biological organic fertilizer and combination were applied to determine the seedling yield, agricultural properties, yield and quality, soil biochemical properties. The results showed that the biological organic fertilizer could improve the agricultural character, seedling emergence rate, soil nutrient, yield and potato block quality of potato. The application of biological organic fertilizer could improve the content of effective nutrients in soil and adjust the pH of soil. Among them, T4 treatment had the most obvious stimulation effect, increasing by 16. 80% compared with the treatment of single sustained-release fertilizer. And the potato potato block had the highest nutrient absorption amount. In terms of quality, T4 treatment had the highest content of crude protein, starch, reducing sugar and Vc, which was 26. 97%, 51. 67%, 166. 94% and 39. 63% higher than the control, respectively. Therefore, the application of bio-organic fertilizer with slow-release fertilizer could increase the effective nutrient content in the soil and improve the yield and quality of potato in the continuous cropping area, among which the T4 treatment effect of mixed application of bio-organic fertilizer I and bio-organic fertilizer was the best. [ABSTRACT FROM AUTHOR]