ABSTRACT
A two-year field experiment was conducted at the National Root Crops Research Institute, Umudike situated in a rain forest agro-ecology in 2020 and 2021 cropping seasons to evaluate the effect of NPK-enriched rice mill waste forms for commercial root production of orange-fleshed sweet potato. Studies in both years were factorial and laid out in a Randomized Complete Block Design (RCBD) with three replications. The experiment involved the application of four levels of NPK 15:15:15 fertilizer at 0 kg/ha, 200 kg/ha, 400 kg/ha and 600 kg/ha, respectively. Rice mill waste involved its carbonized form at 0 t/ha and 5 t/ha and un-carbonized form at 0 t/ha and 10 t/ha respectively. On the average, rice mill waste forms increased the vine length, number of leaves per plant, number of branches per plant, stem girth, but had no significant effects on root yield components. The use of combined application of NPK 15:15:15 fertilizer at 400 kg/ha + 5 t/ha CRMW + 10 t/ha URMW proved satisfactory as total root yield (t/ha) seemed best in both 2020 and 2021 cropping seasons and therefore is recommended for orange-fleshed sweet potato production in Umudike, Abia State, Nigeria.
TABLE
OF CONTENTS
Title
page i
Declaration ii
Certification iii
Dedication iv
Acknowledgments v
Table
of Contents vi
List
of Tables
Abstract
CHAPTER 1
INTRODUCTION
1.1 Background of the Study 1
1.2 Statement of Problem 2
1.3 Objectives of the Study 4
1.4 Justification of the Study 5
CHAPTER 2
LITERATURE
REVIEW
2.1
Origin and Distribution of Sweet Potato 6
2.2 Botany of Sweet Potato 6
2.2.1 Production and production regions 8
2.2.2 Soil and climatic requirement 9
2.2.3
Propagation 10
2.3 Economic Importance of Sweet Potato 11
2.4 Concept of Integrated Nutrient
Management 12
2.5 Effects of Integrated Nutrient
Management on Soil Properties. 14
2.6 Effects of Integrated Nutrient
Management on Crop Yield 16
2.7 Effects of Integrated Nutrient
Management on Yield of Sweet Potato 17
2.8 Effects of Mineral Fertilizer on
Soil Chemical Properties 18
2.9 Effects of Mineral Fertilizer on
Growth and Yield of Sweet Potato 18
2.10 Effects of Organic Manure on Soil
Chemical Properties 21
2.11 Effects of Organic Manure on Growth
and Yield of Sweet Potato 22
2.12 Nutrient Requirements of Sweet Potato 24
CHAPTER 3
MATERIALS
AND METHODS
3.1 Description of the Experimental Site 25
3.1.1 Location of the experiment 25
3.1.2 Rainfall 25
3.1.3 Temperature 26
3.1.4 Relative humidity 26
3.1.5 Sunshine 26
3.1.6 Soils of the study area 26
3.2 Field Experiment 29
3.2.1 Land preparation 29
3.2.2 Experimental design/treatment 29
3.2.3 Planting material 29
3.2.4 Field maintenance 30
3.3 Data Collection 30
3.4 Yield Parameters 30
3.5 Soil Analysis 31
3.6 Statistical Analysis 32
CHAPTER 4
RESULTS
AND DISCUSSION
4.1 Physical and
Chemical Properties of the Soil at the Experimental Site 34
4.2 Effect of
NPK-enriched Rice Mill Waste Forms on the Growth and Yield of 38
Orange-fleshed Sweet Potato
4.2.1 Vine length 38
4.2.2 Number of leaves 44
4.2.3 Number of
branches 49
4.2.4 Stem girth 54
4.3 Effect of
NPK-enriched Rice Mill Waste Forms on the Root Yield of Orange- 59
fleshed Sweet Potato
4.3.1 Total roots yield
weight 59
4.3.2 Marketable roots
yield 60
4.3.3 Unmarketable roots
yield 60
4.3.4 Number of
marketable roots 61
4.3.5 Number of
unmarketable roots 61
4.4 Discussion 75
CHAPTER 5
CONCLUSION AND
RECOMMENDATIONS
5.1
Conclusion 78
5.2
Recommendations 78
REFERENCES 80
APPENDICES 91
LIST
OF TABLES
Page
3.1 Agro-meteorological data of the study area
in 2020 and 2021 28
4.1 Physical
and chemical properties of soils of the experiment area 36
4.2 Chemical
properties of the rice mill waste used in the experiment 37
4.3 Effect
of NPK-enriched rice mill waste forms on the vine length 40
of orange-fleshed sweet
potato in 2020 and 2021 cropping seasons
4.4 Interaction
of NPK fertilizer × carbonized
rice mill waste × un-carbonized 43
rice
mill waste effect on vine length of orange-fleshed sweet potato in
2020
and 2021 cropping seasons
4.5 Effect
of NPK-enriched rice mill waste forms on the number of leaves per 45
plant
of orange-fleshed sweet potato in 2020 and 2021 cropping seasons
4.6 Interaction
of NPK fertilizer × carbonized
rice mill waste × un-carbonized 48
rice
mill waste effect on number of leaves
per plant of orange-fleshed
sweet
potato in 2020 and 2021 cropping seasons
4.7 Effect
of NPK-enriched rice mill waste forms on number of branches of 50
orange-fleshed
sweet potato in 2020 and 2021 cropping seasons
4.8 Interaction
of NPK fertilizer × carbonized
rice mill waste × un-carbonized 53
rice
mill waste effect on number of branches of orange-fleshed sweet potato
in
2020 and 2021 cropping seasons
4.9 Effect
of NPK-enriched rice mill waste forms on stem girth of orange- 55
fleshed sweet potato in 2020 and
2021 cropping seasons
4.10 Interaction
of NPK fertilizer × carbonized
rice mill waste × un-carbonized 58
rice
mill waste effect on stem girth of orange-fleshed sweet potato in
2020
and 2021 cropping seasons
4.11 Effect
of NPK-enriched rice mill waste forms on root yield attributes 62
of
orange-fleshed sweet potato in 2020 and 2021 cropping seasons
4.12 Interaction
of NPK fertilizer × carbonized rice mill waste × un-carbonized 65
rice
mill waste effects on yield and yield components of orange-fleshed
sweet
potato in 2020 and 2021 cropping seasons
4.13
Combined analysis of variance of yield
and yield attributes of orange-fleshed
68
sweet
potato across the two years
4.14
Combined analysis of variance of
interaction of NPK fertilizer × carbonized 71
rice mill waste × un-carbonized rice
mill waste effects on yield and yield components of orange-fleshed sweet potato
across the two years
4.15
Correlation matrix of growth and yield
components of sweet potato in 2020
74
and 2021 cropping seasons
KINGSLEY, C (2023). Response Of Orange-Fleshed Sweet Potato (Ipomoea batatas (L) Lam), To NPK-Enriched Rice Mill Waste (BRAN) Forms For Commercial Root Production In Umudike, Abia State, Nigeria. Repository.mouau.edu.ng: Retrieved Dec 06, 2024, from https://repository.mouau.edu.ng/work/view/response-of-orange-fleshed-sweet-potato-ipomoea-batatas-l-lam-to-npk-enriched-rice-mill-waste-bran-forms-for-commercial-root-production-in-umudike-abia-state-nigeria-7-2
CHINONSO, KINGSLEY. "Response Of Orange-Fleshed Sweet Potato (Ipomoea batatas (L) Lam), To NPK-Enriched Rice Mill Waste (BRAN) Forms For Commercial Root Production In Umudike, Abia State, Nigeria" Repository.mouau.edu.ng. Repository.mouau.edu.ng, 20 Jul. 2023, https://repository.mouau.edu.ng/work/view/response-of-orange-fleshed-sweet-potato-ipomoea-batatas-l-lam-to-npk-enriched-rice-mill-waste-bran-forms-for-commercial-root-production-in-umudike-abia-state-nigeria-7-2. Accessed 06 Dec. 2024.
CHINONSO, KINGSLEY. "Response Of Orange-Fleshed Sweet Potato (Ipomoea batatas (L) Lam), To NPK-Enriched Rice Mill Waste (BRAN) Forms For Commercial Root Production In Umudike, Abia State, Nigeria". Repository.mouau.edu.ng, Repository.mouau.edu.ng, 20 Jul. 2023. Web. 06 Dec. 2024. < https://repository.mouau.edu.ng/work/view/response-of-orange-fleshed-sweet-potato-ipomoea-batatas-l-lam-to-npk-enriched-rice-mill-waste-bran-forms-for-commercial-root-production-in-umudike-abia-state-nigeria-7-2 >.
CHINONSO, KINGSLEY. "Response Of Orange-Fleshed Sweet Potato (Ipomoea batatas (L) Lam), To NPK-Enriched Rice Mill Waste (BRAN) Forms For Commercial Root Production In Umudike, Abia State, Nigeria" Repository.mouau.edu.ng (2023). Accessed 06 Dec. 2024. https://repository.mouau.edu.ng/work/view/response-of-orange-fleshed-sweet-potato-ipomoea-batatas-l-lam-to-npk-enriched-rice-mill-waste-bran-forms-for-commercial-root-production-in-umudike-abia-state-nigeria-7-2