Interactive effect of nitrogen and potassium on dry matter and nutrient partitioning in true potato seed mother plants

Kanzikwera, C. R.; Tenywa, J. S.; Osiru, D. S.O.; Adipala, E.; Bhagsari, A. S.

doi:10.4314/acsj.v9i1.27637

Cited by 1 publication

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“…In 2011 we confirmed that there was no difference in soil inorganic N throughout the growing season due to compost. Potassium application has been shown to increase large and medium tuber yield and decreases small tuber yield (Grewal and Trehan 1993;Kanzikwera et al 2001;Sharma and Arora 1987;Tawfik 2001). Specific gravity decreased in composted treatments (Table 6), and previous research has shown that excess K will reduce specific gravity by increasing tuber water content (Laboski and Kelling 2007;McDole et al 1978;Stark and Westermann 2008;Westermann et al 1994).…”

Section: Resultsmentioning

confidence: 88%

“…Gallandt et al (1998) observed that four and five consecutive years of 22 t ha À1 cull potato compost plus 45 t ha À1 beef cattle manure (supplemented with inorganic fertilizer additions each year) addition resulted in equivalent yields to potatoes grown without amendments under weed free conditions. Potato response to N is cultivar specific (Kanzikwera et al 2001), and none of these studies were performed with the round white cultivar 'Snowden' (a common chipping cultivar in Michigan). There have also been very few published reports of weed competition in potato as influenced by the addition of compost.…”

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confidence: 99%

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Cured Dairy Compost Influence on Weed Competition and on ‘Snowden' Potato Yield

Lindsey

Renner²,

Everman

2013

Weed technol.

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Potatoes are an important global food crop typically produced in high-input systems in temperate zones. Growers that have access to compost may use it to improve soil health and increase tuber yields, but compost may also increase weed competition by increasing early-season water availability and weed growth. A field study at the Michigan State University Montcalm Research farm in 2010 and 2011 investigated the impact of compost on weed competition in potato. Potatoes were grown in field plots with 0, 4,000, or 8,000 kg carbon (C) ha−1of compost under weed-free conditions, and in competition with common lambsquarters, giant foxtail, and hairy nightshade. Compost did not increase biomass or seed production of any weed species. Giant foxtail and hairy nightshade at 5.3 plants per meter of row reduced potato yield by 20%; common lambsquarters reduced yield by 45%. The yield reduction by giant foxtail and hairy nightshade was due to a decrease in tuber bulking, whereas yield reductions from common lambsquarters were a result of lower tuber set and bulking. Potato yield increased 5 to 15% in compost compared to non-compost treatments; tuber specific gravity decreased by 0.3% in composted treatments. Across weed densities, elevated soil potassium levels in the 8,000 kg C ha−1composted treatment may have increased potato yield and decreased tuber specific gravity.

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