ORTHO- AND POLYPHOSPHATE P FERTILIZERS AS AFFECTED BY ADDED ORGANIC MATERIALS AND CALCIUM CARBONATE

Autor:	A. F. Mackenzie, P. N. S. Mnkeni
Rok vydání:	1988
Předmět:	Soil test Chemistry Polyphosphate Sodium Amendment food and beverages Soil Science chemistry.chemical_element complex mixtures Manure chemistry.chemical_compound Calcium carbonate Agronomy Environmental chemistry Soil pH Soil water
Zdroj:	Canadian Journal of Soil Science. 68:243-250
ISSN:	1918-1841 0008-4271
DOI:	10.4141/cjss88-024
Popis:	Studies were conducted in the growth chamber to compare sodium orthophosphate (NaOP), sodium pyrophosphate (NaPP) and PolyN (a triammonium pyrophosphate-orthophosphate mixture) as sources of P for barley in four Quebec soils treated with farmyard manure (FYM) or alfalfa residues. The effect of calcium carbonate was also studied in two acidic soil samples. Added P at 440 kg ha−1 increased barley yields and P uptake on three soil samples. Lack of growth responses at lower rates on a subsoil sample were attributed to soil acidity or micronutrient deficiencies. In nonamended soils, NaOP and NaPP were equally effective as sources of P for barley but PolyN was less effective. In soil samples treated with alfalfa residues, PolyN was as effective as other carriers. These results were attributed to the effects of alfalfa residues in reducing ortho- and polyphosphate sorption. Amendment with FYM masked carrier effects on yield because of the presence of added P in the manure. Soil acidity effects and possible micronutrient deficiencies were ameliorated with added FYM. In CaCO3 amended Uplands topsoil, NaOP was superior to NaPP or PolyN. Key words: Farmyard manure, alfalfa residues, barley, Hordeum vulgare L., pyrophosphate, calcium carbonate
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2a4535d514a1aa5eb1841a9563d79a77 https://doi.org/10.4141/cjss88-024 Zobrazit plný text záznamu