Sweet potato is both a staple and a vegetable crop, containing a significant amount of proteins, provitamin A, B, and C and minerals such as Ca, Fe and Na. Both tuber and shoot can serve for human consumption, livestock feed and for the prevention of skin cancer, indicating the importance of this crop. The tuber is also used for the industrial production of starch, sugar and alcohol. Good quality sweet potatoes should be smooth and firm, with uniform shape and size, be free from mechanical damage, and have a uniform peel color typical of the variety. There are four U.S. Grades for sweet potato (U.S. Extra No. 1, U.S. No.1, U.S. commercial and U.S. No. 2), and grades are based on degree of freedom from defects (dirt, roots, cuts, bruises, growth cracks, decay, insects, and diseases), but also size and weight categories. Biofortification is technically feasible and breeding for micronutrient concentrations that can have biological impact, without compromising agronomic traits, has been demonstrated. There are three methods of breeding 1st Collecting, evaluating, and selecting from the local germplasm. 2nd Importing cultivars that have been bred in other parts of the world and evaluating them under your conditions.3rd breeding cultivars in your own Programme.
Foam Density Characteristics of Sweet Potato Paste Using Glyceryl Monostearate and Egg Albumin as Foaming Agents (Published)
Foaming characteristics of sweet potato paste were investigated. Glyceryl monostearate (GMS) and Egg albumin (EG) were used as the foaming agent. The foams were produced using different level of stabilizers concentration at level of 5%, 7.5%, 10%, 12.5%, 15%. Glyceryl monostearate stabilized foam was found to be stable after whipping of air into the mixture for 3, 6, 9, 12, 15, 18, 21 minutes at 10oC, 20oC and 30oC respectively. The foam density of egg albumin stabilized foam decreased with decreased in temperature while foam density of glyceryl monostearate decreased with increased in temperature. The foams formed by the egg albumin are relatively stable and must be dried as quickly as possible to avoid collapse. Generally, the foam density was found to be inversely proportional to the glyceryl monostearate and egg albumin concentration. Minimum foam density was observed at 6 minute whipping time after which the foam begins to increase
COMPARATIVE ASSESSMENT AND PREFERENTIAL HOST-PLANT OF CYLAS PUNCTICOLLIS BOH. [COLEOPTERA:Brentidae] Damage Potential on Gossypium Hirsutum L. And Ipomoea Spp. At Sangere, Nigeria (Published)
The damage potential and preferential host of Cylas puncticollis Boh. were studied on cotton, Gossypium hirsutum L.; sweet potato; Ipomoea batatas and wild potato weed, Ipomoea eriocarpa on the field in screen cages and potted experiment in 2003-2006 at Sangere, Yola. Two varieties of cotton, SAMCOT 8 and AFCOTT-BENIN seeds were sown in 2003-2005 infested with 5 pairs of C. puncticollis in a completely randomized block design in three replications. Results obtained showed that caged (protected) gave higher yield in g/plant on SAMCOT 8 (43.67, 50.00 and 52.33) and AFCOTT-BENIN (50.33, 46.67 and 52.33) from 2003-2005 respectively. While caged and artificially infested gave lower yield of (38.80, 40.33 and 43.00) and (39.67, 34.33 and 38.00) for SAMCOT 8 and AFCOTT-BENIN respectively. Percentage reduction in yield was higher on AFCOTT-BENIN (21.17, 25.57and 26.80) compared to SAMCOT 8 (12.93, 19.10, 17.80) in same years respectively. Average number of fruiting bodies formed per plant when artificially infested with C. puncticollis on AFCOTT-BENIN (3.33/plant) compared with SAMCOT 8 (2.33/plant). However, the potted experiment carried out in 2006, showed that, I. batatas had yield loss of up to 95.93% and cotton bolls were not developed to maturity (bolls did not form lints).The leaves of cotton were not damaged by the weevils, but sweet potato damaged leaves was 46.95% which was less compared to I. eriocarpa with 54.90 %, but there was no significant difference at p=0.05.The weevils preferred Ipomoea leaves and the fruiting bodies of cotton