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Dissertation/Thesis Abstract

The Effects of Urban Trees and Compost as Soil Amendment for Katrina-flooded Ninth Ward of New Orleans
by Akinrinwoye, Caroline Olufunke, M.S., Southern University and Agricultural and Mechanical College, 2018, 94; 10817075
Abstract (Summary)

A study was conducted at the Southern University Horticulture farm in a greenhouse setting during fall and spring 2018 (30° 31"36.4" N910 11"37.3" W) to evaluate the impact of agroforests on soil from New Orleans Lower Ninth Wards (LNW) 29°"58"22.728" N). Soil was sampled from the New Orleans sites and brought to Southern University Baton Rouge. Before any crop was planted on the soil, nutrient tests were carried out on it to establish the status. A complete randomized design setting composed of three replications and treatments were site, distance from the tree (0 =D0, 7.62 =D25, and 15.24 meters = D50 from the tree canopy and unlimited distance away from tree canopy drip line =UL, respectively) and soil amendment (no amendment as control =AF, compost =COM, and nitrogen fertilizer –N35). Hence, the total number of pots for all treatments was 108 pots. Additional soil samples were collected where there were no trees within an area of 30.48m. Litter grasses were removed before collection of the soil samples. Mustard greens were planted in the pots and weekly heights, chlorophyll level and final biomass recorded. Significant difference in plant height was found among the three sites with the highest plant growth at site 1 (19.5 cm) and lowest at site 3 (16.6 cm). Significant difference in plant height was found among the four distances from the tree canopy drip line with the highest growth at D0 (28.8 cm) with the lowest at UL (26.6 cm). Growth rate determined from the relationship of growing weeks range 1.19 to 1.53 cm/week with the highest rate at D50 and lowest at UL. Significant difference in plant height was found among the three soil amendments with compost amendment the highest (19.8) and with the AF the lowest (17.2). Growth rate for the no amendment (AF) plots was the lowest and the highest was nitrogen fertilizer amendment (N35). Highest chlorophyll reading was found at tree canopy distance close to the tree (D0) with meter reading of 29.2 SPAD and lowest at farther from the tree canopy (UL, 25.3 SPAD). Highest chlorophyll reading was found using nitrogen fertilizer (29.5 SPAD compared with the lowest reading of no amendment (AF, 25.8 SPAD). Highest yield was found at tree canopy distance close to the tree (D0) with fresh and dry weight of 42.5 and 14.9 gm, respectively. Lowest yield was obtained from UL, indicating that trees do contribute nutrients to the soil. Highest yield was obtained from fertilizer as soil amendment (N35), 42.6 gm as compared with the lowest yield with no soil amendment. The study found that agroforests could improve soil fertility of the study area and improve the likelihood of the residents.

Indexing (document details)
Advisor: Ghebrieyessus, Yemane
Commitee: Gebrelul, Sebhatu, Twumasi, Yaw A.
School: Southern University and Agricultural and Mechanical College
Department: Urban Forestry
School Location: United States -- Louisiana
Source: MAI 58/02M(E), Masters Abstracts International
Subjects: Urban Forestry, Agriculture
Keywords: Amendments, Compost, Effects, Floods, Hurricane Katrina, New Orleans, Urban trees
Publication Number: 10817075
ISBN: 978-0-438-64137-2
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