Yield and Water Use of Alternative Rice Production Systems in Tanzania

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Material Information

Title:
Yield and Water Use of Alternative Rice Production Systems in Tanzania Field Experiments and Modeling
Physical Description:
1 online resource (100 p.)
Language:
english
Creator:
Materu, Stanslaus Terengia
Publisher:
University of Florida
Place of Publication:
Gainesville, Fla.
Publication Date:

Thesis/Dissertation Information

Degree:
Master's ( M.S.)
Degree Grantor:
University of Florida
Degree Disciplines:
Agricultural and Biological Engineering
Committee Chair:
SHUKLA,SANJAY
Committee Co-Chair:
BOWEN,WALTER TRUMAN
Committee Members:
ASSENG,SENTHOLD
TARIMO,ANDREW KPR

Subjects

Subjects / Keywords:
ufe0046853
Agricultural and Biological Engineering -- Dissertations, Academic -- UF
Genre:
Agricultural and Biological Engineering thesis, M.S.
bibliography   ( marcgt )
theses   ( marcgt )
government publication (state, provincial, terriorial, dependent)   ( marcgt )
born-digital   ( sobekcm )
Electronic Thesis or Dissertation

Notes

Abstract:
Rice production is important for food security in Africa but it requires large volume of water. Alternative irrigation management strategies that sustain the crop production with lesser volume of water are needed. The goal of this study was to evaluate three alternatives of irrigation management against continuously flooded rice (CF) system through a combined approach of field study and modeling in Tanzania. A field study was conducted in valleys with gentle slope, loam soils in Morogoro region of Tanzania to compare water applied (irrigation volume) and yield of CF against the System of Rice Intensification (SRI), 80% of water applied on SRI (80% SRI) and 50% of water applied on SRI (50% SRI). The experiment was conducted for two rice growing seasons (dry and wet) with a complete randomized block design (CRBD). Weather, crop, and soil water parameters were monitored. Soil-water was measured at 10, 20, 30, 60, 80 and 90 cm depth from soil surface. Plant organ and total biomass, leaf area index (LAI), and yield were also measured. Data were analyzed by SAS software, Complete Randomized Block Design and Tukey Cramer where mean, standard deviation, coefficient of variation and p value were used to compare the results, Results showed that for the dry season, SRI and 80% SRI produced relatively higher rice yield of 9.68 tons/ha and 11.45 tons/ha and saved 26% and 35% of water, respectively compared to CF. For the wet season, SRI and 80% SRI produced slightly higher rice yield 5.99 tons/ha and 6.01tons/ha and saved 18% and 33% of water, respectively compared to CF. Overall, 80% SRI treatment outperformed all other treatments including CF with significant water savings. Field measurements were used to evaluate ORYZA2000, a rice growth model for evaluating different water management strategies. Comparison of model predictions with measured biomass of individual plant organs and total above ground biomass showed that model performance was satisfactory for simulating crops growth, yield, and water balance components. The Nash-Sutcliffe efficiency (NSE) of predicted yield was 0.6 to 0.99 for dry and wet seasons, indicating that model performed well in simulating yield. The NSE for simulated soil moisture ranges from 0.62 for 50% SRI to 0.89 for 80% SRI. The field-verified model was used to simulate several water management scenarios for the SRI production systems, from 50% SRI to SRI. Results showed that 75% SRI and 70% SRI produced highest yield for dry and wet seasons, respectively. Implementation of 75% SRI on rice growing areas in Tanzania is likely to save 422,223 ha-cm of water with 4.9 million tons of additional rice production for the dry season. For the wet season, which accounts for majority of rice produced in Tanzania, implementation of 70% SRI will help save water by irrigating mainly during dry spell periods. Results from the study indicate that the use of SRI production system with almost 25% less irrigation is a sustainable system and should be promoted. Water savings over the CF system can be allocated to other crops and/or other sectors (power generation and environmental supply).
General Note:
In the series University of Florida Digital Collections.
General Note:
Includes vita.
Bibliography:
Includes bibliographical references.
Source of Description:
Description based on online resource; title from PDF title page.
Source of Description:
This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
Statement of Responsibility:
by Stanslaus Terengia Materu.
Thesis:
Thesis (M.S.)--University of Florida, 2014.
Local:
Adviser: SHUKLA,SANJAY.
Local:
Co-adviser: BOWEN,WALTER TRUMAN.
Electronic Access:
RESTRICTED TO UF STUDENTS, STAFF, FACULTY, AND ON-CAMPUS USE UNTIL 2016-05-31

Record Information

Source Institution:
UFRGP
Rights Management:
Applicable rights reserved.
Classification:
lcc - LD1780 2014
System ID:
UFE0046853:00001