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"ABSTRAKPenggunaan fungisida bertujuan untuk melindungi benih dari serangan cendawan patogen penyebab penyakit sehingga benih dapat disimpan lama serta memberantas cendawan penyebab penyakit pada tanaman.Dua macam penelitian dilakukan di Laboratorium dan rumah kaca PAU IPB di Dermaga Bogor untuk mengetahui pengaruh fungisida folirfos pada beberapa konsentrasi (0,04%, 0.12% dan 0,20%) serta fungisida ridomil pada konsentrasi 1,16%, 1,54% dan 2,31%.Penelitian pertama dilakukan untuk mengetahui pengaruh fungisida terhadap perkecambahan benih jagung SD II dan perkecambahan spora cendawan mikoriza arbuskula. Metode yang digunakan adalah rancangan acak lengkap (RAL) dengan 3 ulangan.Hasil penelitian menunjukkan bahwa penggunaan fungisida folirfos pada konsentrasi rendah, sedang dan tinggi tidak menghambat perkecambahan benih jagung dan perkecambahan spora Gigaspora rosea serta perkecambahan Glomus manihotis. Penggunaan ridomil menghambat perkecambahan benih jagung, tetapi tidak menghambat perkecambahan spora Gigaspora rosea dan Glomus manihotis.Penelitian kedua untuk mengetahui pengaruh fungisida terhadap infeksi spora CMA pada akar tanaman jagung dan jumlah spora CMA pada tanah basah dan kering bekas pertanaman jagung dengan metode rancangan acak lengkap (RAL) dengan 3 ulangan. Pengaruh fungisida dan mikoriza terhadap jumlah daun dan tinggi tanaman jagung menggunakan rancangan acak lengkap (faktorial) dengan 3 ulangan.Hasil penelitian menunjukkan bahwa penggunaan fungisida tidak berpengaruh terhadap infeksi CMA pada akar tanaman jagung dan jumlah spora CMA pada tanah basah dan tanah kering. Kombinasi perlakuan fungisida dan spora CMA juga tidak berpengaruh terhadap jumlah daun dan tinggi tanaman jagung.Dari hasil penelitian ini dapat disimpulkan bahwa penggunaan fungisida folirfos dapat diberikan pada benih jagung dan pada spora Gigaspora rosea dan Glomus manihotis, sedangkan fungisida ridomil tidak dapat diberikan pada benih jagung, namun dapat diberikan pada spora Gigaspora rosea dan Glomus manihotis.Untuk keberadaan CMA pada tanaman jagung penggunaan fungisida tidak mempengaruhinya. Sedarigkan jumlah dan tinggi tanaman jagung tidak dipengaruhi oleh penggunaan fungisida dan mikoriza.

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ABSTRACT

One of the purposes of using fungicides is to protect seeds against the attack of pathogenic fungi that cause diseases, so that seeds can be stored longer and fungi that cause disease can be eliminated.

Two experiments were performed in a green house of PAU IPB Bogor, Dermaga, to find out the influences of folirfos fungicide with low concentration (0.04%), medium concentration (0,12%) and high concentration (0,20%), and ridomil fungicide with low concentration (1,16%), medium concentration (1,54%) and high concentration (2,31%) to SD II variety of sweet corn seed germination, to the spore germination of vecsicular - arbuscular (VA) mycorrhizal fungi, Gigaspora rosea and Glomus manihofis, VA mycorrhizai fungi infection on roots, the number of VA mycorrhizal fungi spores on wet soil and dry soil, the number of leaves and the height of corn trees.

The first experiment was performed to find out the influences of folirfos fungicide and ridomil to corn seeds germination and germination of VA mycorrhizal fungi spores.

The results showed that the use of folirfos fungicide with low, medium and high concentrations did not inhibit the the germination of corn seeds, whereas ridomil fungicide with low, medium and high concentrations inhibited the germination of corn seeds. For the germination of Gigaspora rosea, folirfos fungicide with low, medium and high concentrastiens did not inhibit the germination of Gigaspora rosea, whereas ridomil fungicide with medium and high concentrations did not inhibit the germination of Gigaspora rosea either. Ridomil fungicide with low concentration (F4) was still able to increase the germination of Gigaspora rosea amounting to 64,16%, whereas for the germination of Glomus manihofis, the use folirfos and ridomil fungicide could increase the germination of Glomus manihofis spores. Ridomil fungicide with medium concentration (F5) was still able to increase the germination of Glomus manihotis spores amounting to 22,5%.

The second experiment was performed to find out the influences of folirfos fungicide to the VA mycorrhizal fungi on roots of corn trees, and the amount of VA spores on wet soil and dry soil which were previously planted with corn trees, as well as the influences of both fungicides and a mycorrhizal inoculum to the number of leaves and the height of corn trees.

The results showed that folirfos fungicide and ridomil did not influence the infection of VA mycorrhizal fungi on the roots of corn trees and the amount of VA spores on wet soil and dry soil. The combination of treatment of fungicide and VA spores did not significantly influence (p>0,05) the number of leaves and the height of corn trees, 1 can be concluded, from the fisrt experiment, that the use of folirfos fungicide with any level of concentration can be given to the seeds of corn because it did not inhibit germination, whereas ridomil fungicide with low, medium and high concentrations can not be given to the seeds of corn because it inhibit germination. As for the germination of VA mycorrhizal fungi, ridomil fungicide with low concentration (F4) can be given to Gigaspora rosea, because the spores were still able to germinate up to 64,14%.

From the second experiment I can conclude that folirfos fungicide as well as ridomil fungicide with any level of concentration can be used for corn trees containing mycorrhizal fungi, because both fungicide did not influence the existence of VA mycorrhizal fungi on the trees, the number of leaves as well the height of the corn trees."

"Studi Keankaragaman Hayati Di Situs Song Keplek Punung Pegunungan Sewu, Kabupaten Pacitan, Jawa TimurPasca Sarjana Biologi-FMIPAUI,2000Penelitian fosil polen dan spora di Danau Wuyang Warak dan Kerta Gebang Kawasan karst Pegunungan Sewu, Jawa Timur, dilakukan pada 3 periode, yaitu : 20 - 23 Desember 1997, 26 28 April 1998, dan tanggal 7 - 8 Maret 1999. Pengambilan contoh tanah dilakukan dengan teknik pengeboran sampai kedalaman ± 6 m. Di setiap lokasi diambil masing-masing dua contoh tanah. Pengamatan polen dan spora menggunakan mikroskop binokuler transmisi merek Leits dengan perbesaran 1.250 kali. Determinasi dilakukan pada foto polen menggunakan buku- buku acuan ; Erdtman (1943 & 1986), Hyde & Adams (1958), Kapp (1969), Huang (1972), Moore & Webb (1978), Morley (1977), Murillo & Bless (1978) dan foto-foto koleksi laboratorium eksploitasi LEMIGAS, Jakarta serta preparat dan slide yang telah teridentifikasi.Hasil identifikasi fosil polen dan spora mengindikasikan bahwa di daerah penelitian pernah menjadi habitat bagi tumbuhan mangrove, back mangrove, hutan rawa air tawar, hutan hujan pegunungan bawah, hutan hujan pegunungan atas dan bawah, serta riparian.Masyarakat di kawasan karst Kecamatan Punung Pegunungan Sewu mengupas lapisan kapur pada lahan yang datar dan setengah miring untuk dijadikan sawah dan kebun serta menanam jenis tanaman yang dianggap mempunyai nilai ekonomi tinggi tanpa mernperdulikan kemampuan medium tumbuh. Pola eksploitasi pertanian tradisional yang ada yaitu pola pertanian di Pulau Jawa yang intensif dan pola di luar Pulau Jawa dengan cara tebas bakar dan masa kosong.Pola pertanian di kawasan karst Pegunungan Sewu berkembang akibat adanya pertambahan penduduk, pemekaran pemukiman dan daerah pertanian yang menggunakan pola bertani intensif dengan memanfaatkan daerah-daerah marginal atau hutan lindung.

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Situs Song Keplek is one of the pre-historic sites which is located at Kecamatan Punung apart the Sewu mountain limestone formation right in the border of Central and East Java provinces.

The limestone formation of the Sewu mountain had undergone several physiographic transformations since the Pleistocene time or from two million years ago up to the present.

This study is intended to describe past ecosystem Situs Song Keplek based on fossilized pollens and spores escavated from the sites and present floral composition of the situs.

The research was carried (conducted) out in three different visits on December 20 - 23, 1997; April 26 - 28 1998, and March 7 - 8 1999.

The fossil samples were taken from the bottom or the sediment of Wuyang Warak lake which is still watered up until today and Kerta Gebang lake which is only seasonally watered. The study identified 53 species of 29 families of plants. In Wuyang Warak lake, it was found 29 species of angiosperms and 9 species of pteridophytes with high frequency of Monoprites annulatus (83 pollens), followed by Cyatides sp. (50 spores), Blechnum fraxineum (46 spores), Lycopodium elavatum (28 spores), Podocarpus amaurus (28 pollens), and Lycopodium microphyllum (27 spores). In Kerta Gebang lake, there were 17 species of angiosperms and 18 species of pteridophytes with high frequency of Monoprites annulatus (210 pollens), followed by Podocarpus amaurus (163 pollens), Pteris ensiformis (17 spores), Selaginella sp. (11 spores), and Mimosa sp. (10 pollens).

Sorensen similarity indeks reveals an index of 24% similarity of pollens and spores between two lakes.This figure indicates that the two locations were different in term of their floral compositions which were probably due to their different physiographic environment altitude during the past.

Approximately about 10000 years ago, the sites probably composed of the mangrove back mangrove fresh water tropical rain forest and riparian ecosystems.

The incontinuity of the vegetation pattern in the area could be related to the change of the climate as well as by the presence of human being in the environment since long time.

The findings of Wuyang Warak and Kerta Gebang lakes show a similarity with those of Julianto (1994) who conducted a research in Nampol formation, Jaten formation, and Andjarwati (2000) who conducted a research in Situs Kali Banjar and Situs Gua Tabuhan. The pollen and spore fossils found in Jaten formation concisted of 53 species and 5 families of plants, while in Jaten formation concisted of 32 species and 5 families of plants, in Situs Kali Banjar, the pollen and spore fossils were from 21 familiesof plants and in Situs Gua Tabuhan were from 16 families of plants.

Karst vegetation of the Sewu mountain is not various and mostly composed of wild bushes grows covering the slope of the hill. This is because the people replace the formely existing forest with vegetation of economic value.

Our record on the Baduy practice of agriculture, indicates that traditional wisdom contribute to the conservation of the environment as well as the variety of the local plants and forest. The slash and burn practice of agriculture does not disturb the soil surface, hence proverigation of the soil is prevented."