Nutritive Value Of Vetiver Grass Silage Supplement With Some Silage Additive
Varunee Panichpol, Chit Yoothavorawit and Sompon Waipanya
Division of Animal Nutrition, Department of Livestock Development, THAILAND.

To improve the nutritive value of Vetiver grass, cv. Ratchaburi using a 30 day cutting interval, was ensiled by adding 0.5% urea (Treatment 2), 10% molasses (Treatment 3), 1 5% mixed ground cassava chip (Treatment 4), 0.5% urea + 10% molasses (Treatment 5), 0.5% urea + 1 5% mixed ground cassava chip (Treatment 6) and compared with untreated Vetiver grass (Treatment 1 as Control). After 30 days, the result was that Treatment 3, 4 and 5 had good quality in terms of palatability, pH, and percentages of dry matter, lactic acid, butyric acid, nutritive value and dry matter digestibility. Treatment 6 was judged of fair quality due to higher percentages of butyric acid. Treatment 1 and 2 were of poor quality.

Vetiver Grass (Vetiveria Nemoralis) As Substrate For Mushroom Cultivation.
Yongyuth Saifa, Prawit Taptimorn and Prapaisri Pitakpaivan. Applied Microbiology Group, Plant Pathology and Microbiology Division, Department of Agriculture, Thailand.

Preliminary study on the cultivation of four different species of mushroom (Genus Pleurotus) using dried vetiver grass (Vetiveria nemoralis) as substrate, was conducted during March 1994 - January 1995 at Som Dej Pra Sri Nakarin Royal Garden, Huai Sai Royal Development Center, Petchaburi Province. They are Pleurotus sp. Florida (Hed Hang Rom Kao), Pleurotus sp. from Hungary (Hed Nang Rom Hungary), Pleurotus sp. (Hed Bhuthan), and P. abalonus (Hed Pao Hu). Pasteurization and non-pasteurization methods were applied. Two formulae of the first method used for substrate preparation were : Coarse ground vetiver grass mixed with rice bran, sugar, magnesium sulphate (100 kg.: 4 kg.: 2 kg.: 0.2 kg.) and water as needed (mic 60-65%) and cut vetiver grass composted with 7% with rice bran. These mixture were bagged, pasteurized and spawned.

It was observed that the first formula produced higher yield in every species. The second method was non pasteurization where cut soaked vetiver grass was bagged and spawned simultaneously. Fruiting bodies were observed only on two mushroom species Plourotus sp. Florida and Pleurotus sp. from Hungary.

Vetiver (Vetiveria zizanioides) Straw For The Cultivation Of Oyster Mushroom (Pleurotus Spp)
A.S. Krishnamoorthy and S.Balasubramanyan. Regional Research Station Kovilangulam - 626 107 Tamilnadu, India

Possibility of utilizing vetiver (Vetiveria zizanioides) grass for the cultivation of Pleurotus euos (serk) Sacc., P. salmoneo - Stramineus L. Vass., P. citrinopileatus (Fr) Singer, P. Sajorcaju (Fr) Singer: P. platypus (Cooke and masee) sacc., was explored. P. euos, P.salmoneo - Stramineus and P. Platypus colonised the vetiver straw early (within 13 days) and yielded 355 to 405 g of mushroom/bed (Bio-efficiency ranged from 70 to 80 per cent). Paddy straw and paddy straw + Vetiver grass (1:1 w/w) gave significantly higher yields (437.1 and 434.7 g/bed respectively) than vetiver alone (385.9 g/bed).

Allelopathic Effects Of Vetiver Grass On Weeds
Sombun Techapinyawat, Khunying Suchada Sripen and Thiamjai Komkris, Botany Department, Faculty of Science, Kasetsart University, Thailand.

Vetiver is a tropical perennial grass, widely distributed thoughout Thailand. Vetiver is cultivated for erosion control as well as a sort of barrier to prevent the invasion of weeds. Experiments were performed to investigate allopathic effects of vetiver grass on weeds. Methanol extract of ground dried stems and roots of 3 vetiver ecotypes were tested on 10 common weed species. It was found that root and stem extracts from 3 Vetiver ecotypes: Ratchaburi, Suratthani and Indonesia strongly inhibited seed germination and seedling growth of Amaranthus gracilis Desf., Abutilon hirtum Sweet, Pennisetum polystachyon Schult, Melochia corchorifolia Linn. and Ruellia tuberosa Linn.. The degree of inhibition depended on the vetiver ecotypes, concentration of the extracts, and weed species dependent. The study also suggests the possibility of developing a natural herbicide from vetiver grass which will leave hopefully little or no toxic residue harmful to the environment.

Study On Compost Making From Vetiver Grass
Pluechaya Thunyadee et.aI. Land Development Department, Ministry of Agricultural and Cooperatives, Bangkok, Thailand.

The studies on compost making from vetiver grass were carried out at 5 sites: namely Ratchaburi, Srisaket, Chiang Mai Land Development Station, Khao Hin Sorn and Pikun Thong Royal Development Study Centre. The design was observation trial with 4 treatments. The treatments were

1) Making compost on the ground with LDI rhizobium and turn over.

2) Making compost in the hole with LDI rhizobium and turn over.

3) Making compost on the ground with high tech rhizobium.

4) Making compost in the hole with high tech rhizobium.

After 150 days the results showed that the ratio between carbon and nitrogen from treatment 1 is the best, followed by treatment 2,4 and 3 with the ratio of 20, 23, 26 and 29 respectively. It also found that the chemical and physical properties of T1 is the best followed by T2, T4 and T3. The pH value ranging between 6.9 - 7.2.