Effects Of Planting Depth And Cutting Orientation On Growth And Yield Of Sweet Potato Ipomoea Batatas L Lam Cultivars For Small Scale Production In Verulam

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Effects Of Planting Depth And Cutting Orientation On Growth And Yield Of Sweet Potato Ipomoea Batatas L Lam Cultivars For Small Scale Production In Verulam

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Author : Ntombifuthi Zanele. Q Pakkies
language : en
Publisher:
Release Date : 2018

Effects Of Planting Depth And Cutting Orientation On Growth And Yield Of Sweet Potato Ipomoea Batatas L Lam Cultivars For Small Scale Production In Verulam written by Ntombifuthi Zanele. Q Pakkies and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Importance of the sweet potato categories.

Improvement Of Sweet Potato Ipomoea Batatas In Asia

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Author :
language : en
Publisher: International Potato Center
Release Date : 1989

Improvement Of Sweet Potato Ipomoea Batatas In Asia written by and has been published by International Potato Center this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Sweet potatoes categories.

Country and research reports on sweet potato; CIP research and transfer program; Present status and future prospects of sweet potatoes in Bangladesh; Sweet potato production and research in china; Sweet potato production, utilization and constrains in India; Sweet potato production, utilization, and research in Indonesia; Country report of LAO P.D.R. participants; Sweet potato cultivation in Malaysia: a country report; Country paper - papua New Guinea; Sweet potato research and development in the Philippines; The outline for sweet potato in Korea; Sweet potato in Thailand; The Sweet potato in Vietnam; Development and testing of an integrated pest management technique to control sweet potato weevil; Digestibility of sweet potato starch; Sweet potato breeding in Japan: its past, present and future; Recent studies on dry matter production physiology; Sweet potato adaptation studies at North Carolina State University; Nutritional aspects of sweet potato roots and leaves; Sweet potato research at the International Potato Center; Research activities in CIP on sweet potato virus diseases; In vitro sweet potato germplasm management; Strategies to develop sweet potatoes with weevil resistance in developing countries; Important nematode parasites of sweet potatoes and their management; Constraints to sweet potato production and use; Sweet potato production and consumption surveys: variability and varieties; CIP's program for human resources development through training; Workshop on sweet potato improvement in Asia: highlights of session presenting CIP sweet potato research programme.

Agronomical And Physiological Factors Affecting Growth Development And Yield Of Sweet Potato In Ethiopia

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Author : Terefe Belehu
language : en
Publisher:
Release Date : 2013

Agronomical And Physiological Factors Affecting Growth Development And Yield Of Sweet Potato In Ethiopia written by Terefe Belehu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

Morphological and anatomical studies demonstrated the root formation characteristics of sweet potato. The presence and importance of preformed root primordia is recorded for the first time. On the vines root primordia are present in sets of four to ten adjacent to the leaf bases. These roots originate from the procambium on both sides of the leaf gap. Macroscopically the root tips of preformed root primordia protruding through the cortex and epidermis of the stems are prominent. The preformed root primordia produce adventitious roots, with pentarch, hexarch or septarch steles. Storage roots will under normal circumstances only originate from undamaged root primordia on the nodes of cuttings, or on nodes of newly formed vines, or from wound roots originating from the cut ends of the stem or leaf cuttings. Lateral roots originating from damaged root primordia, or directly from the adventitious roots, exhibit tetrarch steles and develop into fibrous roots without the potential to develop into storage roots. This understanding of the origin, anatomy and morphology of sweet potato roots should improve production practices, which will contribute to improved crop establishment and increased yield. Differences in the contribution of individual subterranean nodes to storage root yield were studied. On average cuttings with three subterranean nodes produced 3.7 storage roots, with 33.2% on subterranean node 1, 30.0% on node 2 and 36.8% on node3. However, in terms of fresh mass of the storage roots node 1 contributed 45.4%, node 2 contributed 27.1% and node 3 contributed 27.4%. The effect of temperature (20, 24, 28 and 32oC constant), orientation of cuttings (vertical vs. horizontal) and size of cuttings (1 or 3 nodes) on the development of adventitious roots was observed in plant growth chambers. Twenty-one days after planting, the longest total root length of 4m per plant was recorded from the 24oC growth chamber. The effect of soil moisture content on early root development was investigated by wetting and equilibrating sandy soil to 100, 80, 60 and 40% of field capacity. Although the 80% of field capacity treatment resulted in the best root development, differences among treatments were small, demonstrating the capacity of cuttings to successfully establish under a range of soil moisture contents. Changes in dry mass of storage roots, stems, and leaves of three sweet potato cultivars (Awasa-83, Bareda and Falaha) were studied at Awasa and Melkassa. At the final sampling the early maturing cultivar Falaha had diverted a higher proportion of the total dry mass into storage roots at Melkassa because of the early initiation and growth of storage roots. The late maturing cultivar Awasa-83 had a smaller proportion of the total dry mass diverted into the storage roots at both locations because of late root initiation and growth. The high yielding cultivars Bareda at Melkassa, and Awasa-83 at Awasa, had higher crop growth rates and higher net assimilation rates than the other cultivars. The effects of cultivar (Kudadie, Bareda and Awasa-83), planting position (horizontal and vertical), type of planting material (terminal cuttings with and without leaves) and cutting length (20, 25 and 30 cm) on the number and yield of storage roots were quantified in field trials at Awasa and Melkassa. Cultivar Kudadie produced the highest storage root yield at both locations. Horizontal planting of cuttings resulted in the highest total storage root yield at both locations. Cutting length did not affect storage root number and yield. The effect of population density (50,000, 55,555, 75,000, and 100,000 cuttings per hectare) on the performance of the three Ethiopian sweet potato cultivars was studied at Awasa. The highest planting density consistently produced the best root yield, indicating the potential to increase yields with plant populations much higher than normally used. Early maturing cultivar Falaha produced more small and medium storage roots per plant, while the intermediate cultivar Bareda produced more large storage roots. ©2003, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. Please cite as follows: Belehu, T 2003, Agronomical and physiological factors affecting growth, development and yield of sweet potato in Ethiopia, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd

Phloem Development In Three Sweet Potato Ipomoea Batatas Lam Cultivars

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Author : Celmira De'. Calderon
language : en
Publisher:
Release Date : 1980

Phloem Development In Three Sweet Potato Ipomoea Batatas Lam Cultivars written by Celmira De'. Calderon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Sweet potatoes categories.

Centennial, jasper and Porto Rico sweet potato (Ipomoea batatas Lam) cultivars were studied to determine phloem tissue development. Plant height, petiole lenght, number of leaves and number of storage roots were also recorded for the comparative analysis. Five points on the plant were sampled phloem cross-sectional area was measured over ten harvest periods. Samples were taken every 10 days, beginning 14 days after planting. The results showed that growht is similar for all three cultivars; however, a significant difference in plant lenght among cultivars was observed at the 9th harvest perio (94 days after planting). Phloem cross-sectional areas also similar for the three cultivars. When the size of the phloem cross-sectional area (PCSA) was the criteria for ability of the plants to move photosynthate to the storage roots (sinks), the phloem in the main stem was the limiting root "stalks"was less than that in the main stem; however, as etorage root number increased the total amount of the phloem in the storage root "stalks"available for translocation was greater than that in the main stem.

The Tropical Tuber Crops

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Author : I. C. Onwueme
language : en
Publisher: John Wiley & Sons
Release Date : 1978

The Tropical Tuber Crops written by I. C. Onwueme and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Agriculture categories.

Crop Science

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Author : I. C. Onwueme
language : en
Publisher: Weidenfeld & Nicolson
Release Date : 1979

Crop Science written by I. C. Onwueme and has been published by Weidenfeld & Nicolson this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Crops categories.