Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer

Sweet potato (Ipomoea batatas (L.) Lam) is an important food in developing countries that is rich in beta-carotene and vitamins. A field experiment was conducted in UPM to evaluate the response of yield and yield components and nutritive quality of five sweet potato varieties planted on two diffe...

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Main Author:	Vosawai, Ratu Penaia
Format:	Thesis
Language:	English
Published:	2013
Subjects:	Sweet potatoes Fertilizers
Online Access:	http://psasir.upm.edu.my/id/eprint/67700/1/FP%202013%2075%20IR.pdf
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id	my-upm-ir.67700
record_format	uketd_dc
spelling	my-upm-ir.677002019-03-27T01:36:24Z Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer 2013-12 Vosawai, Ratu Penaia Sweet potato (Ipomoea batatas (L.) Lam) is an important food in developing countries that is rich in beta-carotene and vitamins. A field experiment was conducted in UPM to evaluate the response of yield and yield components and nutritive quality of five sweet potato varieties planted on two different sites with four levels of nitrogen fertilizer applied. The experiment used a split plot design with nitrogen as main plot in three replications and variety as the subplots. The nitrogen fertilizer levels used were 0, 17, 34 and 68 kg N/ha and the varieties were from UPM germplasm collection of sweet potato obtained from various parts of Malaysia. The varieties were labelled A, B, C, D and E. The results showed that nitrogen fertilizer rates affected yield components, including fresh tuber yield, vine length, and leaf number and stomatal conductance. The response curves obtained indicated an optimum fertilizer rate of 50 kg N/ha is recommended in Field 2 and 40 kg N/ha in Field 10. The highest fresh tuber yield was 14 t/ha in Field 2 and 3 t/ha in Field 10. The differences were attributed to better soil texture and fertility in Field 2 compared to Field 10. Application of nitrogen fertilizer to sweet potato also affects its nutritive quality. Application of 50 kg N/ha in Field 2 and 40 kg N/ha in Field 10 favors the nutritive quality in sweet potato tuber in terms of total sugar, beta-carotene, vitamin C, protein and fat. Sweet potatoes Fertilizers 2013-12 Thesis http://psasir.upm.edu.my/id/eprint/67700/ http://psasir.upm.edu.my/id/eprint/67700/1/FP%202013%2075%20IR.pdf text en public masters Universiti Putra Malaysia Sweet potatoes Fertilizers
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English
topic	Sweet potatoes Fertilizers
spellingShingle	Sweet potatoes Fertilizers Vosawai, Ratu Penaia Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
description	Sweet potato (Ipomoea batatas (L.) Lam) is an important food in developing countries that is rich in beta-carotene and vitamins. A field experiment was conducted in UPM to evaluate the response of yield and yield components and nutritive quality of five sweet potato varieties planted on two different sites with four levels of nitrogen fertilizer applied. The experiment used a split plot design with nitrogen as main plot in three replications and variety as the subplots. The nitrogen fertilizer levels used were 0, 17, 34 and 68 kg N/ha and the varieties were from UPM germplasm collection of sweet potato obtained from various parts of Malaysia. The varieties were labelled A, B, C, D and E. The results showed that nitrogen fertilizer rates affected yield components, including fresh tuber yield, vine length, and leaf number and stomatal conductance. The response curves obtained indicated an optimum fertilizer rate of 50 kg N/ha is recommended in Field 2 and 40 kg N/ha in Field 10. The highest fresh tuber yield was 14 t/ha in Field 2 and 3 t/ha in Field 10. The differences were attributed to better soil texture and fertility in Field 2 compared to Field 10. Application of nitrogen fertilizer to sweet potato also affects its nutritive quality. Application of 50 kg N/ha in Field 2 and 40 kg N/ha in Field 10 favors the nutritive quality in sweet potato tuber in terms of total sugar, beta-carotene, vitamin C, protein and fat.
format	Thesis
qualification_level	Master's degree
author	Vosawai, Ratu Penaia
author_facet	Vosawai, Ratu Penaia
author_sort	Vosawai, Ratu Penaia
title	Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
title_short	Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
title_full	Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
title_fullStr	Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
title_full_unstemmed	Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
title_sort	yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer
granting_institution	Universiti Putra Malaysia
publishDate	2013
url	http://psasir.upm.edu.my/id/eprint/67700/1/FP%202013%2075%20IR.pdf
_version_	1747812503808638976

Yield and nutritive quality of five sweet potato varieties in response to four levels of nitrogen fertilizer

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