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Yield and quality of agar in the cultivated plants of Gracilaria edulis were determined. Methods of analysis are described. The yield of agar and the time of extraction, gel strength, gelling and melting temperatures of the agar were given. Based on the results, harvesting is advocated every three months after planting. An increase in gel strength of agar on addition of 5 % potassium chloride was noticed.The necessity, principles and problems involved in the cultivation of marine algae have been discussed by Krishnamurthy (1967). The main reason for proposing the cultivation of marine algae in India is the growing demand for raw-material for economic exploitation. An attempt was made to cultivate Gracilaria edulis and the results were reported (Raju and Thomas 1971). Healthy plants of Gracilaria edulis were collected and 2 cm fragments were taken out from the apicai portions of the plants. The fragments were inserted into the twists of rope at intervals of 5 cm and the ropes were tied to poles planted in the sea in such a way äs to be held one foot below low water level. The average growth in length of the plants was ascertained by the measurement of 20 plants selected at random, while average increase in weight was determined on the basis of 10 plants which were harvested every month for the purpose. The harvesting was done by clipping the plants, leaving a small portion at the base. The ropes were then left undisturbed to observe further growth. The first harvesting was made at the end of five months and the second and third harvest were made at the end of four months each and the fourth harvest three months later. It has been found that the yield was greater in the second and third harvest compared to that of the flrst and fourth harvest.It was desired to determine the percentage yield and quality of the agar of the cultivated plants. For this purpose plants obtained from each harvest of an experimental culture of Gracilaria edulis started on 30. 12.68 were used. The harvested plants were first washed in fresh water to remove salts and other impurities on the surface. The plants were then bleached and dried by spreading them in the shade and sprinkling the plants with water at intervals and alternately drying them in air. After a few days, the plants were completely bleached and then they were allowed to dry. When the plants were completely dry, they were pulverised in a blender. Twenty-five grams of the powdered material were taken in a vessel and water was added in the ratio l :20 and agar extracted under steam pressure of 15 Ib in a pressure vessel. Extraction was carried out in six batches for periods ranging from one hour to six hours. The extractive was then filtered through a muslin cloth into a ractangular tray and frozen in the freezing chamber of a refrigerator for twenty-four hours, defrozen, thawed and dried at 50 °C to constant weight. The residue left after the first extraction was re-extracted by giving the same period under the same pressure. The percentage yield of agar was calculated from the...

RESUMO:O amendoim Arachis hypogaea L. é uma das principais oleaginosas cultivadas no Brasil, porem o tripés do prateamento Enneothrips flavens é considerado uma praga limitante na produção e o uso de cultivares resistente evita ou reduz a aplicação de inseticida proporcionando uma maior segurança e lucratividade à atividade. O trabalho foi realizado com os objetivos de avaliar a resistência aos tripés, com o uso de genótipos de amendoinzeiro de habito de crescimento ereto e o potencial produtivo RESISTANCE TO YIELD PEANUT ARACHIS HYPOGAEA, GROWTH HABIT OF STANDING, THE THRIPS E. FLAVENS AND POTENTIAL PRODUCTION SUMMARY: The Arachis hypogaea L. is a major oilseed crops in Brasil, however the tripods of silveringEnneothrips flavens is considered a pest limiting the production and use of resistant cultivars prevents or reduces insecticide application providing greater security and profitability to the activity. The study was used to evaluate the resistance to tripods, using genotypes of groundnut upright growth habit and yield potential of peanut genotypes . The experiment was carried out at the Teaching and Research of the Fazenda de Ensino e Pesquisa da Faculdade de Engenharia de Ilha Solteira -UNESP, on 12/11/2010 at sowing using genotypes IAC -Tatu -ST , IAC 81-12 , IAC 88-1 , IAC 88-2 , IAC 22 and IAC 24 , upright growth habit and without insecticide . Sampling started on 29/11/2010 and the ten subsequent performed on a weekly basis, there were scores of adults and nymphs of tripods ; ratings of symptoms of damage , leaf area , plant height and yield. The design adopted in the experiment was a completely randomized design with four replications. Each experimental unit consisted of 4 rows of 5 m long. The largest population of E. flavens occurs from 30 to 72 days after plant emergence. The IAC 88-1 and IAC -Tatu -ST are less infested by E. flavens and IAC 88-2 shows less signs of damage caused by this pest. The IAC IAC 88-2 and 81-12 have the highest yields and yields even with high infestations of E. flavens.

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