ESTIMATE OF MACRONUTRIENTS UPTAKE BY ARRACACHA AT HARVEST

Carlos E. Ortiz and Nilsa M. Acin

No 256966, 33rd Annual Meeting, July 6-12, 1997, Isabela, Puerto Rico from Caribbean Food Crops Society

Abstract: In Puerto Rico, arracacha or apio is a minor crop planted for its yellowfleshed corm. The climatic requirements of this crop restrict its commercial production to high elevations where ultisols are common. Previous studies did not examine the amount of nutrients that must be supplied by the soil-fertilizer combination for optimum crop development and yield. The objective was to estimate arracacha's macronutrient uptake in a soil typically used for its production. The experiment was planted on a Humatas soil (Typic Tropohumults) under rain-fed conditions. Three levels of Κ fertilization were used (45, 90 and 135 kg/ha). Yield and plant fresh weight were recorded at harvest; then the plant parts were oven dried. The nutrient concentrations in the tissues were obtained to estimate nutrient uptake. Neither yield, plant parts fresh and dry weight nor nutrient concentrations in tissues were affected by the level of Κ fertilization. Fresh corm yield was 4.8 t/ha. On a dry weight basis, the crop harvest index was 0.81. Except for K, the nutrients were more concentrated in the leaf lamina. Uptake of Ν and Κ were the highest, whereas Ρ and Ca uptake tended to be intermediate between the N-K group and Mg uptake. Nutrient harvest indexes exceeded 0.35.

Keywords: Crop Production/Industries; Productivity Analysis (search for similar items in EconPapers)
Pages: 6
Date: 1997-07-06
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://ageconsearch.umn.edu/record/256966/files/33-18.pdf (application/pdf)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs97:256966

DOI: 10.22004/ag.econ.256966

Access Statistics for this paper

More papers in 33rd Annual Meeting, July 6-12, 1997, Isabela, Puerto Rico from Caribbean Food Crops Society
Bibliographic data for series maintained by AgEcon Search ().