The influence of meteorological conditions on the content of strach of potatoes tubers grown on a sandy loam soil
2005
Kupcinskas, V. (Lithuanian Institute of Agriculture, Perloja, Varena distr. (Lithuania). Research Station), E-mail: [email protected] | Baniuniene, A. (Lithuanian Institute of Agriculture, Perloja, Varena distr. (Lithuania). Research Station) | Zekaite, V. (Lithuanian Institute of Agriculture, Perloja, Varena distr. (Lithuania). Research Station) | Sidlauskas, G. (Lithuanian Institute of Agriculture, Dotnuva (Lithuania)), E-mail: [email protected]
With the aim to evaluate the effect of meteorological factors and mineral nitrogen, phosphorus and potassium fertilizers on the starch content of potato tubers grown on san-dyloam soil with and without manure fertilization, the data of 23 years of field trials were analyzed. The trials were carried out on Hapli-Albic Luvisols at the Lithuanian Institute of Agriculture Perloja Station during 1979-2002. According to the collected data, the optimum precipitation rate during the vegetative growth period, the optimum mean daily temperature, the calendar length of the growth period and the optimum growing days with the baseline temperature of 0,5 and 10 deg C for the starch content of potato tubers grown on two backgrounds (with and without manure) were found. The optimum parameters of the growing period for starch content on the background without manure application were: 362.1 mm precipitation rate, 15 deg C mean daily temperature, 128 (days) calendar length of the growth period and 1960.7, 1327 and 670.9 deg C accumulated by plants growing degree days with the baseline temperature of 0, 5 and 10 deg C accordingly. When manure was applied, the optimum indices were: 333.6 mm precipitation rate, 14.8 deg C mean daily temperature, 134 (days) calendar length of the growth period and 1957.9, 1309.8 and 655 deg C accumulated by plants growing degree days with the baseline temperature of 0,5 and 10 deg C, respectively. The efficacy of mineral nitrogen, phosphorus and potassium fertilizers was higher without manure application. Manure application decreased the impact of meteorological factors on the starch content of potato tubers
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