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Valtcho D. Zheljazkov, Charles L. Cantrell, M. Wayne Ebelhar, Dennis E. Rowe, and Christine Coker

same time, the plants from all plots were dried at 40 °C for 72 h and the dry weight recorded. Essential oil extraction and analyses. The essential oils from all basil samples were extracted with steam distillation using a modified Clevenger

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Ricardo Goenaga, Tomas Ayala, and Adolfo Quiles

Scientific, Fort Collins, CO) using 20 g of soil in 40-mL distilled water. Soil ammonium and nitrate were determined by steam distillation ( Mulvaney, 2007 ). Bicarbonate was determined in a saturated soil paste by titrating with 0.05 N sulfuric acid

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Ricardo Goenaga, David Jenkins, and Angel Marrero

with 1 n ammonium fluoride and 0.5 n HCl and determined using the ascorbic acid method ( Benton, 2001 ). Organic carbon was determined by the Walkley–Black method ( Nelson and Sommers, 2007 ). Soil ammonium and nitrate were determined by steam

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Ricardo Goenaga and David Jenkins

Sommers, 2007 ). Soil ammonium and nitrate were determined by steam distillation ( Mulvaney, 2007 ). Table 1. Average preplant soil characteristics at two rambutan test sites in Puerto Rico measured to a depth of 25 cm (9.84 inches). Table 2. Weather data

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Ricardo Goenaga and David Jenkins

and determined using the ascorbic acid method ( Benton, 2001 ). Organic carbon was determined by the Walkley–Black method ( Nelson and Sommers, 2007 ). Soil ammonium and nitrate were determined by steam distillation ( Mulvaney, 2007 ). Originally, the

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Ricardo Goenaga and David Jenkins

Sommers, 2007 ). Soil ammonium and nitrate were determined by steam distillation ( Mulvaney, 2007 ). Table 1. Average preplant soil characteristics at two mamey sapote test sites in Puerto Rico measured to a depth of 25 cm (9.8 inches). Table 2. Weather

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Ricardo Goenaga

) ( Amacher, 2007 )] and determined by inductively coupled plasma (ICP) spectrometry ( Sumner and Miller, 2007 ). Organic carbon was determined by the Walkley-Black method ( Nelson and Sommers, 2007 ). Soil ammonium and nitrate were determined by steam

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W.A. Mackay, S.W. George, C. McKenney, J.J. Sloan, R.I. Cabrera, J.A. Reinert, P. Colbaugh, L. Lockett, and W. Crow

-available macro- and micronutrients. Rose leaf tissues were dried at 60 °C and ground to pass a 1-mm sieve. The tissue was analyzed for total nitrogen by using a Kjeldahl digestion followed by steam distillation and titration procedures. Total phosphorus was

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Ricardo Goenaga, Angel Marrero, and Delvis Pérez

determined by the Walkley-Black chromic acid wet oxidation method ( Nelson and Sommers, 2007 ). Soil NH 4 -N and NO 3 -N were determined by steam distillation ( Mulvaney, 2007 ). The 92-year mean annual rainfall is 1649 mm and Class A pan evaporation is 1672

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Ricardo Goenaga, Brian Irish, and Angel Marrero

determined by inductively coupled plasma (ICP) spectrometry ( Sumner and Miller, 2007 ). Organic carbon was determined using the Walkley-Black method ( Nelson and Sommers, 2007 ). Soil ammonium (NH 4 ) and nitrate (NO 3 ) were determined by steam distillation