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This study was conducted to evaluate essential oils from Croton macrostachyus Hochst. ex Delile, Eucalyptus globulus Labill., Allium sativum L., Cymbopogon citratus (DC.) Stapf, Cymbopogon martini (Roxb.) W.Watson, Rosmarinus officinalis L. and Thymus schimperi Ronniger using four concentrations (l mL, 2 mL, 3 mL, 4 mL) and three sprays against potato (Solanum tuberosum L.) late blight disease. Two improved potato varieties were planted using randomized complete block design with factorial combinations in three replications. Analysis of disease incidence means at 53 and 60 days after planting showed highly significant differences between varieties and among sources of essential oils. Furthermore, the combined effect of essential oils and potato varieties on disease severity showed significant differences. Disease severity was maintained from 25% to 48% (Jalene); 13% to 30% (Gudene) with essential oils while it was maintained between 92% and 95% (Jalene); 37% to 38% (Gudene) for control plants. The lowest disease percentage of disease severity was obtained on plants treated with A. sativum for Jalene variety while on plants sprayed with C. macrostachyus, E. globulus and T. schimperi for Gudene variety. The lowest disease progress rate 0.198/day and 0.162/day as well as values of area under disease progress curve 228% days and 93% days were obtained for varieties Jalene and Gudene, respectively. Maximum reduction in mean disease severity was exhibited by garlic for varieties Jalene (28.3%) and Gudene (16.3%), as compared to the control (93.3% for Jalene and 37.5% for Gudene). Therefore, results indicated the potentials of essential oils to minimize effects of potato late blight disease. Communities involved in potato production could use the current results as base line information to find alternative management options for late blight disease which has no effect on human health and environment. However, further investigation is required on essential oils affordability and availability to farmers across different locations.

In this study, field experiment was conducted to assess the effect of different doses of NPK on tuber yield on the potato (Solanum tuberosum L.) varieties such as Inovator, Gala, Aladin and Tyanshansky in foothill zone of the southeast of Kazakhstan. Five different combinations of NPK with control were studied. Results revealed that the fertilizer application increased the total tuber yield, the longest plant, number of main stem, number of leaves plant and average tuber number on the potato significantly over control. The highest tuber yield was obtained when 25% more than the recommended fertilizer dose with manure was applied at all potato varieties. Aladin potato variety significantly yielded higher than the other varieties tested at the same time in this experiment.

The article presents the results of studies on the influence of mineral fertilizers and chicken manure on the productivity of potato tubers of domestic and foreign selection. In the studies conducted in 2017-2019 on leached chernozem under the conditions of the Penza region, it was found that when chicken manure and mineral fertilizers are applied, the yield and quality of tubers increases, which is directly related to the supply of plants with nutrients. The use of chicken manure at a dose of 2 t/ha allowed to increase the total yield of tubers of the studied varieties of potatoes by 22.6-29.5%, marketable tubers by 24.3-35.5% compared with the variant without fertilizers. The highest yields were observed in variants with the combined use of carbamide in a dose of N30 and potassium sulfate at a dose K60 and in variants with a combined use of ammophos at a dose N30P30K30 and potassium sulfate at a dose K30. The use of moderate doses of mineral fertilizers and chicken manure at a dose of 2 t/ha increases not only the productivity of potato tubers, but also the content of dry matter, starch and nitrates in the tubers, not exceeding the MAC value. The combined use of nitrogen-potassium and nitrogen-phosphorus-potassium fertilizers with the addition of potassium sulfate at doses of K60 and K30 can improve the quality indicators of tubers for all studied varieties.

The objective of this three-year study was to evaluate the effect of foliar application of dedusted potassium sulphate and chelated forms of microelements on the contents and accumulation of zinc (Zn), copper (Cu), manganese (Mn) and iron (Fe) as well as on the quality parameters of potato tubers at the stage of full maturity. Four treatments were analysed, including the control, where only nitrogen, phosphorus and potassium fertilisation was applied. Consistent with the experimental design adopted, other trials included: (I) Double foliar treatment with potassium sulphate in the combined dose of 8.6 K kg ha−1 (SOP); (II) double foliar treatment with micronutrients: 12 g Zn ha−1, 12 g Cu ha−1, 300 g Mn ha−1 and 500 g B ha−1 (Micro) and (III) combined application of SOP and Micro on two scheduled terms (SOP + Micro). Two potato varieties were tested: The French fries variety Zorba and the crisps variety Hermes. The experiment was arranged in a randomised complete block design with four replicates for each potato variety. Both the two-fold foliar spray with micronutrients and the treatment combined with the application of potassium sulphate resulted in the enhanced content and accumulation of the elements examined. The significant effect of the experimental factor was especially visible for the content and uptake of manganese and iron. Moreover, a highly significant relationship was determined between the tuber contents of protein and starch. The tuber quality parameters were most significantly conditioned by manganese and iron for the French fries variety and by zinc, copper and manganese for the crisps variety.

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1297

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1299

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, Kathleen G. Haynes, and Lincoln Zotarelli http://edis.ifas.ufl/edu/hs1298

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1300

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1296

by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, Kathleen G. Haynes, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1295

Explains the results of the trials and describes the cultivars. Published by the Horticultural Sciences Department.by Rodrick Z. Mwatuwa, Christian T. Christensen, Pam Solano, and Lincoln Zotarelli http://edis.ifas.ufl.edu/hs1293

This 5-page fact sheet describes a new University of Florida potato variety named Snowden. ‘Snowden’ is a potato variety that is commonly grown for the potato chip market. It was named and released in 1990 from the University of Wisconsin’s Lelah Starks Potato Breeding Farm in Rhinelander, WI. Tuber production and quality results provided in this spotlight are summarized from various variety trials conducted by the University of Florida’s Hastings Agricultural and Extension Center from 1998 to 2015. Written by Rodrick Z. Mwatuwa, Christian T. Christensen, and Lincoln Zotarelli, and published by the Horticultural Sciences Department, October 2016. HS1286/HS1286: University of Florida Potato Variety Trials Spotlight: 'Snowden' (ufl.edu)

This article introduces the potato variety, ‘Atlantic’, which was tested in trials at the University of Florida. ’Atlantic’ is a white-skinned, chipping potato commonly cultivated in Florida and resealed as a white mutant of the USDA breeding program. This 4-page fact sheet provides the general characteristics, season length and growth information, fertilization and planting instructions, as well as disease information for the potato variety, ‘Atlantic’. Written by Rodrick Z. Mwatuwa, Christian T. Christensen, and Lincoln Zotarelli, and published by the Horticultural Sciences Department, March 2016. HS1278/HS1278: University of Florida Potato Variety Trials Spotlight: 'Atlantic' (ufl.edu)

This article introduces the potato variety, ‘Marcy’, which was developed at the University of Florida. ‘Marcy’ is a white-flesh and white-skinned fresh-market potato variety that has demonstrated high yield and good tuber characteristics. This 3-page fact sheet provides the general characteristics, season length and growth information, fertilization and planting instructions, as well as disease information for the potato variety, ‘Marcy’. Written by Rodrick Z. Mwatuwa, Christian T. Christensen, and Lincoln Zotarelli, and published by the Horticultural Sciences Department, March 2016. HS1277/HS1277: University of Florida Potato Variety Trials Spotlight: 'Marcy' (ufl.edu)

The black dot disease of potato is a fungal disease caused by Colletotrichum coccodes (syn. C. atramentarium) that produces accervuli on infected underground plant parts which appear as black dots. The disease appears at the flowering stage and develops up to the season end. The survey on black dot disease of potato in two successive years indicated that the infection percentage is 39.86 in Feraydan (Isfahan), one of the most important potato production regions in Iran. Studies on usual cropping patterns with, potato including, wheat alfa-alfa, barley and fallow showed that in terms of disease infection, one year rotation with fallow reduced the disease severity almost to half compared with control and other cropping patterns. Biological seed and soil treatment, with Trichoderma harzianum in various spores density reduced the disease in various degrees significantly and increased the potato plant growth factors including the number of stems, foliage fresh and dry weights, and also the yields in cases of spore applications, depending upon the type and application dosage. Comparative susceptibility assessments of 24 commercial potato varieties to the black dot disease indicated that the variety Desiree was the least concerned in terms of infection, followed by Scort ,Casser, Casmos, Carlita and Moren , where as Marijke, Cosima and Monalisa were highly infected in comparison to other tested verities and the rests of varieties were scored within these two ranges.