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Open AccessArticle

Yield, Decomposition, Mineralization and Nitrification of Annual Legumes in an Oxisol

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Agro-Environmental Sciences Department, University of Puerto Rico-Mayagüez, Box 9000, Mayagüez, PR 00681, USA
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Former Student, Agro-Environmental Sciences Department, University of Puerto Rico-Mayagüez, Box 9000, Mayagüez, PR 00681, USA
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Author to whom correspondence should be addressed.
Agronomy 2018, 8(11), 244; https://doi.org/10.3390/agronomy8110244
Received: 12 August 2018 / Revised: 30 October 2018 / Accepted: 31 October 2018 / Published: 2 November 2018
(This article belongs to the Section Soil and Plant Nutrition)
Knowledge about seasonal and litter bag soil position effects on litter decomposition (k value), mineralization and nitrification rate of annual legumes in Puerto Rico is limited. This study determined dry matter yield (DMY), k value of litter bags placed below and above the soil surface, mineralization and nitrification rates of Lablab purpureus cv. “Rongai” and Mucuna pruriens (Velvet bean) seeded in the wet and dry season in Oxisol soils (Typic Eustrustox). There was an interaction (p < 0.05) for season and legumes on DMY, k value and N content. “Rongai” DMY was higher for the dry than wet season while Velvet bean had an opposite seasonal response. Higher k value occurred in the wet season for legumes, but “Rongai” had higher k than Velvet bean. For both legumes, N content was higher on litter bag placed below-ground in both seasons. However, in the wet season, there was less N in the above ground litter position. Higher inorganic N was observed at 90 days of soil incubation (DOI) suggesting that N was not available prior to 42 DOI. Nitrification rate was higher for “Rongai” at 22 DOI and lower at 42 and 90 DOI for both legumes. Both legumes enhanced inorganic N, but, regardless of season, Rongai supplied nutrients to the soil faster than Velvet bean. “Rongai” because of its higher k value than Velvet bean is recommended for fast growing row or vegetable crops in Puerto Rico. View Full-Text
Keywords: cover crops; lablab; legumes; mineralization; nitrification; velvet bean; yield cover crops; lablab; legumes; mineralization; nitrification; velvet bean; yield
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MDPI and ACS Style

Tirado-Corbalá, R.; López-Ramos, L.Y.; Valencia-Chin, E.; Román-Paoli, E. Yield, Decomposition, Mineralization and Nitrification of Annual Legumes in an Oxisol. Agronomy 2018, 8, 244.

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