Ipomea Batatas

00120

Changes in yields and fertilizer responses with continuos cropping in Uganda. Summary; 5 tables;
Stephens, D. (Makerere University College, Kampala, Dept. of Agricultural Chemistry). Experimental Agriculture (United Kingdom). (1969). v. 5 p. 263

AGROVOC: IPOMEA BATATAS; FARMYARD MANURE; COMPOUND FERTILISERS; UGANDA.

Local RN	: NA000123.
Rec. status	: N.
Prim. sub. cat	: F04.
Type of Rec	: J. Bibl.lev....: AS. Lit.ind.: E.
Location/access	: ARIS

00459

Optimum number of vine per heap and length of vine cutting for optimum tuber yield in sweet potato (Ipomea batatas).
Ocitti, P.C;Emokol, W. (Ministry of Agriculture, Kampala (Uganda). Namulonge Research Station).Kampala (Uganda). 7 p. 2 ill.; 3 ref.; Summary
*Namulonge Research Station, Kampala (Uganda).

AGROVOC: IPOMEA BATATAS; CLIMBERS; CUTTINGS; TRIALS; YIELDS; UGANDA; EXPERIMENTS; TUBERS; SITE FACTORS.

The effect of length of vines (NV) per heap were studied between September 1984 and January 1985 at Nakabango Variety Trial Centre and Serere. At Nakabango tuber yield increased with increasing LVC but decreased as LVC exceeded 30cm. At Serere tuber yield increased as from LVC 20cm to 35cm after which it decreased. The highest yields were obtained from LVC30cm and 35cm at Nakabango and Serere respectively. LVC had no significant effect on yield though it positively but insignificantly correlated with yield. Yield was significantly affected by Location. There was an inverse relationship between the number of developing tubers and final tuber yield at harvest. As the number of developing tubers increased with increasing LVC, tuber yield decreased. Tuber yield increased with increasing number of plants per heap but decreased as from 4 plants/heap. LVC 25-35cm produced high tuber while less than 25cm established more slowly and gave poorer yields.

Local RN	: NA000473.
Rec. status	: N.
Prim. sub. cat	: F01. Sec.sub.cat.: F02.
Type of Rec	: B. Bibl.lev....: MC. Lit.ind.: V.
Location/access	: Namulonge Res. Inst. Library

00461

Comparative study on vine placement methods on yield of sweet potato (Ipomoea batatas 1.).
Ocitti P’obwoya, C.N. (Ministry of Agriculture, Animal Industry snd Fisheries, Kampala (Uganda). Namulonge Research Station). Kampala (Uganda). Aug 1987. 3 p. 1 table; Summary
*Namulonge Research Station Kampala (Uganda).

AGROVOC: IPOMOEA BATATAS; PLANTING; CUTTING; YIELDS; TUBERS; CLIMBERS; UGANDA; EXPERIMENTS; CLIMBERS.

The effects of vine placement on tuber yield of sweet potato were studied in 1987 at Serere. The highest fresh tuber yields were obtained from vines planted in a triangle (T) form onridged seedbeds for varieties TIS 8250 and IITA 5. Yield was very highly significantly (p=0.01) affected by variety. Planting vines in T form increases tuber yield while vines planted singly (s) and in cluster (c) gave relatively lowyields although there was no significant difference in yields. The experiment is being repeated in different agri-ecological Zones.

Local RN	: NA000475.
Rec. status	: N.
Prim. sub. cat	: F01. Sec.sub.cat.: F02.
Type of Rec	: B. Bibl.lev....: MC. Lit.ind.: V.
Location/access	: Namulonge Res. Inst. Library

00465

Comparative study on vine placement methods on yield of sweet potato (Ipomoea batatas 1.).
Ocitti P’obwoya, C.N. (Ministry of Agriculture, Animal Industry and Fisheries, Kampala (Uganda). Namulonge Research Station). Kampala (Uganda). Aug 1987. 3 p. 1 table; Summary
*Namulonge Research Station Kampala (Uganda).

AGROVOC: IPOMOEA BATATAS; PLANTING; CUTTINGS; YIELDS; TUBERS; UGANDA; EXPERIMENTS; CLIMBERS.

The effects of vine placement on tuber yield of sweet potato were studied in 1987 at Serere. The highest fresh tuber yields were obtained from vines planted in a triangle (T) form onridged seedbeds for varieties T IS 8250 and IITA 5. Yield was very highly significantly (P=0.01) affected by variety planting vines in a T form increases tuber yield while vines planted singly(s) and in cluster (c) gave relatively low yields although there was no significant difference in yields. The experiment is being repeated in different agro-ecological Zones.

Local RN	: NA000479.
Rec. status	: N.
Prim. sub. cat	: F01. Sec.sub.cat.: F02.
Type of Rec	: B. Bibl.lev....: M. Lit.ind.: V.
Location/access	: Namulonge Res. Inst. Library

00466

Sweet Potato-Cassava-Bean Intercropping Systems.
Ocitti, P.C.; Emokol, W. (Ministry of Agriculture, Animal Industry and Fisheries, Kampala (Uganda). Namulonge Research Station). Kampala (Uganda). 1987. 3 p. 2 tables; Summary
*Namulonge Research Station, P. O. Box 7084, Kampala (Uganda).

AGROVOC: IPOMOEA BATATAS; INTERCROPPING; YIELDS; UGANDA; COMMONBEANS; ZEA MAYS; MANIHOT ESCULENTA.

A study was conducted at Nakabango variety Trials Centre near Jinja, to study the interaction effects on sweet potato crop when grown in association with cassava, maize and beans. Cassava, maize and beans reduced sweet potato yield by 59.3,8.7 and 10, respectively. Maize and beans had insignificant effect on sweet potato yield and quality. Thus sweet potato can be grown conveniently in association with beans or maize. Future studies aim at minimising the large cassava effect in the system through staggering the plant ing dates and varying; special arrangements of cassava since cassava, normally remains in the field longer.

Local RN	: NA000480.
Rec. status	: N.
Prim.sub.cat	: F01. Sec.sub.cat.: F02.
Type of Rec	: B. Bibl.lev....: MC. Lit.ind.: V.
Location/access	: Namulonge

00467

Vine placement and plant density interaction effects on the yield of sweet potato.
Ocitti P’obwoya, C.N. (Ministry of Agriculture, Kampala (Uganda). Namulonge Research Station). Kampala (Uganda). 1990. 2 p. 1 table; Summary
* Namulonge Agricultural Research Institute, P. O. Box 7084, Kampala (Uganda).

AGROVOC: IPOMOEA BATATAS; PROPAGATION BY CUTTINGS; SPACING; YIELDS; UGANDA; TRIALS; PLANTING; PLANT POPULATION.

The interaction effects of vine placement methods and plant density on the yield of sweet potato (Ipomea batatas) were studied between 1988 0 at Namulonge Research Station. The position of the vines on the mound has no significant effect on tuber yield although the triangularly placed (TP) vines out yielded the centrally placed vines.

Local RN	: NA000481.
Rec. status	: N.
Prim.sub.cat	: F01. Sec.sub.cat.: F02.
Type of Rec	: B. Bibl.lev....: MC. Lit.ind.: V.
Location/access	: Namulonge

00468

The effect of seedbed preparation on tuber yield and quality of sweet potato and the economic implications.
Ocitti, P.C. (Ministry of Agriculture, Kampala (Uganda). Namulonge Research Station). 1989. 5 p. 2 tables; 2 ref. Summary
Eastern and Southern Africa Regional Root crops Workshop. Mansa (Zambia). 29 Oct-2 Nov 1990.

AGROVOC: IPOMOEA BATATAS; SEED BED PREPARATION; YIELDS; LABOUR COST; UGANDA; RIDGING; MOUNDS.

The effect of seed preparation on tuber yield and quality was investigated in a field experiment between 1988 and 1989 at Namulonge Research Station. Total yields of sweet potato were highest and lowest from ridged and flat seedbeds, respectively. Yields were significantly different (P=0.05)among types of seedbed. In terms of tuber quality ridged seedbed gave superior quality tubers but there was no significant difference in the quality of tubers. The ratio of labour input for ridging and mound making is 1:2. Thus ridging requires less labour input with high economic returns.

Local RN	: NA000482.
Rec. status	: N.
Prim.sub.cat	: F01. Sec.sub.cat.: F02; E12.
Type of Rec	: B. Bibl.lev....: M. Lit.ind.: V.
Location/access	: Namulonge

00712

Development, evaluation and selection of new root crop varieties in Uganda.
Mwanga, R. (Ministry of Agriculture, Animal Industry and Fisheries, Kampala (Uganda). Namulonge Research Station). 1991. 2 p. *Namulonge Research Station, POB 7084 Kampala (Uganda).

AGROVOC: IPOMOEA BATATAS; MANIHOT ESCULENTA; BREEDING METHODS; SELECTION; VARIETIES; UGANDA; EVALUATION; YIELDS; PEST RESISTANCE; DISEASE RESISTANCE; HYBRIDISATION.

The document discusses the methods and techniques used in the root crop programme in Uganda. Knowledge of yield-reducing factors like environmental stresses, weeds, diseases, insects, nematode and vertebrate pests as well as problems facing farmers is important. The programme aims at developing clones that are high yielding, stable, resistant to pests and disease, adaptable to Local environmental conditions, of high quality and are early maturing. Improved cultivars are obtained through 3 main ways namely: collecting, evaluating and selecting from Local germplasm, importing cultivars bred in other parts of the world and evaluating them under Local conditions and breeding new cultivars.

Local RN	: NA000732.
Rec. status	: N.
Prim.sub.cat	: F30. Sec.sub.cat.: F01.
Type of Rec	: B. Bibl.lev....: M. Lit.ind.: V.
Location/access	: Namulonge Agric. Res. Inst. Library

00894

Progress in sweet potato varietal improvement in Uganda.
Mwanga, R.O.M.; Mateeka, B. (Namulonge Agricultural and Animal Production Research Institute, Kampala (Uganda)).6 tables; 4 ref. Summaries (En, Fr).African Crop Science Conference Proceedings (Uganda). ISSN 1023 X. (Oct 1994). v. 1(1) p. 58-61. African Crop Science Conference. Kampala (Uganda). 14-18 Jun 1993.

AGROVOC: IPOMOEA BATATAS; HYBRIDS; CLONES; PLANT BREEDING; VARIETY TRIALS; TESTING; CROP YIELD; PLANT NURSERIES; UGANDA.

The relative importance of sweet potatoes as a basic staplefood in Uganda and past sweet potato breding are mentioned. The paper also presents results of breeding trials conducted between 1990 and 1992 at Namulonge, Tororo and Nakabango. The trials were conducted to identify superior genotypes and cultivars with desirable traits to be used as parents in Isolated polycross nurseries for generating breeding populations. Hybrid seeds, 128 and 650, production in 1989/90 and clones and cultivars in the clonal. Intermediate and multi Locational trials provided genetic materials for screening against biotic factors and for selecting desirable traits. Storage root yields ranged between 0 and 60 tons/ha and 41 tons/ha in the clonal and intermediate yield trials respectively. Fresh root yields in the multi Locational and yield evaluation trials varied between 6 and 30 tons/ha. Cultivars Mpaeifumbiro, Kawogo, Wagabolige, Tanzania, Tororo 2 and 3 and entries 29 and 39 were superior. They had both moderate level of tolerance to viruses and high root potential parents for poly cross nursaries

AGRIS TRN	: UG9500094.
Local RN	: NA000914.
Rec. status	: N.
Prim. sub. cat	: F30.
Type of Rec	: L.Bibl.lev....: AS. Lit.ind.: KNZEV.
Location/access	: ARIS

00918

Effect of length of storage of vine cuttings on yield of quality sweet potato.
Ocitti P’Obwoya, C.N.; Mateeka, B. (Namulonge Agricultural and Animal Production Research Institute, Kampala (Uganda)).2 tables; 4 ref. Summaries (En, Fr).African Crop Science Conference Proceedings (Uganda). ISSN 1023 X. (Oct 1994). v. 1(1) p. 169 African Crop Science Conference. Kampala (Uganda). 14-18 Oct 1993.

AGROVOC: IPOMOEA BATATAS; CUTTINGS; STORAGE; PROPAGATION BY CUTTINGS; TUBERS; YIELDS; DRY MATTER CONTENT; UGANDA.

Length of vine storage up to seven days after cutting had no significant effect on sweet potato tuber and vine yield, tibia quality and dry matter content. Therefore pre-rooted vines have no comparative yield advantage over freshly cut and planted vines may be advantageous for quick establishment, especially under dry conditions

AGRIS TRN	: UG9500116.
Local RN	: NA000938.
Rec. status	: N.
Prim.sub.cat	: F02.
Type of Rec	: J. Bibl.lev....: AS. Lit.ind.: KZEV.
Location/access	: ARIS