The efficiency of application urea with urease inhibitor to increase potato yield

In the article are presented the investigation results, which shows the effectiveness of urea with urease inhibitor – nBPT in potato growing agroecosystems. The advantages of the new fertilizer are the yield increase, and quality improvement. Urea with nBPT lead to formation bigger tuber size what is one of the most important characteristic for marketable potato. Fertilizer was tested in experimental fields and in real farm conditions.

Возделывание картофеля в кормовом севообороте на дерново-подзолистой почве Севера

Определено положительное влияние совместного применения органических и минеральных удобрений на продуктивность и качество картофеля, а также на плодородие дерново-подзолистой среднеокультуренной почвы в кормовом севообороте в условиях Республики Коми. Условный чистый доход составил 72,6 тыс. р/га, себестоимость 1 т картофеля – 2,9 тыс. р., рентабельность – 246,9%.The positive effect of the combined use of organic and mineral fertilizers on the productivity and quality of potatoes, as well as on the fertility of sod-podzolic medium-cultivated soil in the Komi Republic was determined. It is established that the optimal method of potato fertilizer in the fodder crop rotation is a complex application of organic and mineral fertilizers. At the same time, a significant yield of tubers with high quality was obtained.

Biological activity of clear gray forest soil for different potato fertilizer systems

The article deals with the question of changing the microbiological state and biological activity of the soil in different potato fertilizer systems in the short-term crop rotation of Polissya. It was found that with the consistent application of ma-nure with moderate mineral fertilizer standards, the structure of microbiological cenosis of the soil changes: against the background of their aftereffects, the total number of microorganisms increases by an average of 31%, ammonifiers - by 33%, phosphor mobilizing bacteria - by 2.6 times. The coefficients of mineralization and soil oligotrophy are calculated. It has been proved that all biological processes have positive correlation bonds with the total number of microorganisms, bacteria that use mineral nitrogen forms, ammonifiers, phosphoramidizers and actinomycetes.

SOURCES OF POTASSIUM IN POTATO FERTILIZER AND TIMES OF APPLICATION

Potatoes (Solanum tuberosum L. ’Kennebec’) receiving similar N, P and K nutrition showed no consistent changes in yield, specific gravity and quality of boiled tubers when K2SO4 and KNO3 were substituted for the commonly-used KCl. Broadcasting three-quarters of the K as KCl the previous fall, compared with banding at planting, had no effect on yield or quality.

An association of infection by Sclerotinia sclerotiorum and potassium deficiency in Kennebec potato

In a potato fertilizer trial planted with the variety Kennebec a high proportion of the plants in the plots to which no potassium had been applied was infected by the fungus Sclerotinia sclerotiorum (Lib.) de Bary. Potassium chloride reduced the incidence of the disease; sulphate of ammonia increased it.

Comparisons between placing and broadcasting of nitrogen, phosphorus and potassium fertilizers for potatoes, peas, beans, kale and maize

1. In eight experiments on main-crop potatoes in 1953–4 placing 0·5 cwt. N/acre in a band beside the seed tended to give higher yields than broadcasting the dressing; when 1·0 cwt. N/acre was applied, broadcasting tended to be superior to placement. There were no consistent gains from placing 1·5 cwt. K2O/acre.2. Four other potato experiments in 1954–6 tested all combinations of placing and broadcasting two levels of nitrogen and potassium. There was no clear relationship between the effects of broadcasting or placing one nutrient and the way in which the other nutrient was applied. When 0·5 cwt. N was applied, placing gave higher yields in seven out of ten possible comparisons (one effect was significant). With 1·0 cwt. N/acre there were also seven of ten comparisons in favour of placement (three significant effects), but in two other comparisons broadcasting gave significantly higher yields. Placing potassium gave higher yields than broadcasting in sixteen out of twenty comparisons (six significant effects), in one of the remaining comparisons broadcasting potassium was significantly superior. Placing of the potassium and, to a lesser extent, the nitrogen components of a complete potato fertilizer is likely to be beneficial.3. In two experiments each on green peas and broad beans placing of phosphorus and potassium separately and together gave consistently higher yields than broadcasting these nutrients. When nitrogen was used in addition to phosphorus and potassium there were small gains in yield of broad beans provided the mixture was placed. There were no gains in yields of green peas from nitrogen however the mixture was applied.