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Effect and aftereffect of fertilizing on the conditional balance of nitrogen phosphorus and potassium in monoculture maize



Effect and aftereffect of fertilizing on the conditional balance of nitrogen phosphorus and potassium in monoculture maize



Pochvoznanie Agrokhimiya i Rastitelna Zashtita 21(2): 36-42



A study was carried out to establish the changes induced by notably high NPK rates, stockpiled or applied annually for three years to monoculture maize, in the contents of available P and K in the soil and in the nutrient balance for this period and for the aftereffect period. The experiment was carried out with three fertilizer rates: N340P280K280, N440P320K320 and N510P360K369 on an irrigated field. It was found that in the first three years of maize continuous cropping the tested fertilizer rates resulted in a positive balance of the three nutrients and 198.8 to 730.7 kg N/ha, 546.7 to 785.6 kg P/ha and 121.6 to 330.0 kg K/ha remained in the soil, exercising an aftereffect in the following years. By the end of the fourth year of the aftereffect period, a positive N balance was found in the highest fertilizer rate treatment. Phosphorus fertilizers had the longest aftereffect. The balance of this nutrient remained positive at all three fertilizer levels even after 7 years of maize continuous cropping. Potassium fertilizers had the weakest aftereffect: a negative balance at all fertilizer levels was observed as early as the end of the second year of the aftereffect period. The three high rates of P fertilizer application had moved the studied soil from the low-supply group into the good-supply group within three years. Available K in the 20-40 cm layer was increased in all the three treatments.

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