Judul: Arbuscular Mycorrhizal Symbiosis of Upland Rice  Intercropped with Shallots
Abstrak: IKHSANNUL AMAL. Mikoriza Arbuskula pada Padi Gogo Tumpang Sari dengan Bawang Merah. Dibimbing oleh NAMPIAH SUKARNO dan AHMAD JUNAEDI Aplikasi cendawan mikoriza arbuskula (CMA) merupakan salah satu upaya untuk meningkatkan produktivitas padi gogo. Penelitian ini bertujuan menganalisis pengaruh CMA dan sistem tanam terhadap pertumbuhan vegetatif serta produktivitas padi dan bawang merah. Penelitian menggunakan rancangan acak lengkap (RAL) dengan satu faktor yaitu kombinasi sistem tanam padi dengan bawang merah dan inokulasi CMA. Parameter yang diamati pada padi dan bawang merah ialah persentase kolonisasi CMA, tinggi tanaman, jumlah daun, volume dan bobot akar, sedangkan untuk padi terdapat parameter lain yaitu jumlah anakan, bobot batang, helai daun, seludang daun, dan malai, nilai SPAD, kerapatan malai, jumlah butir, persentase gabah isi dan gabah hampa, bobot 100 butir, indeks panen, dan rasio tajuk:akar. Hasil penelitian menunjukkan kombinasi CMA dan sistem penanaman tidak memengaruhi pertumbuhan vegetatif tetapi memengaruhi beberapa parameter pertumbuhan generatif tanaman padi seperti bobot malai, persentase gabah isi, indeks panen dan persentase gabah hampa. Kolonisasi CMA pada padi yang ditumpangsarikan dengan bawang merah yang diinokulasi CMA meningkatkan rasio tajuk:akar padi dan tinggi tanaman bawang merah., IKHSANNUL AMAL. Arbuscular Mycorrhizal Symbiosis of Upland Rice Intercropped with Shallots. Supervised by NAMPIAH SUKARNO and AHMAD JUNAEDI Arbuscular mycorrhizal fungal (AMF) application is one of the efforts to increase the upland rice productivity. This study aimed to analyze the effect of AMF application and planting system on the vegetative growth and productivity of rice and shallots. This study used a completely randomized design with one factor, namely a combination of rice planting system with shallots and AMF inoculation. The parameters measured in rice and shallots were plant height, number of leaves, volume and weight of root. Meanwhile, for rice there were additional parameters observed namely number of tillers, weight of stem, leaf blade, leaf sheath, and panicle, SPAD value, panicle density, number of grains, percentage of filled and empty grains, weight of one hundred grains, harvest index, and shoot:root ratio. The results showed that the combination of AMF application and planting system did not affect vegetative growth but did affect several parameters of generative growth of rice such as panicle weight, percentage of filled grain, harvest index and percentage of empty grain. AMF colonization in intercropped rice and shallots increased shoot:root ratio and shallots plant height.
Keyword: AMF, panicle weight, percentage of filled grain, percentage of root colonization, shoot:root ratio

Judul: Application of Mycorrhiza Powder and Granules in Improving the Vegetative and Generative Phases of Shallots (Allium ascalonicum L.) in Regosol Dramaga
Abstrak: Pemanfaatan Regosol sebagai media tumbuh tanaman belum mendukung harapan produksi yang tinggi dengan kesuburan yang rendah dan hara mudah tercuci. Peningkatan produktivitas bawang merah dilakukan melalui upaya pemupukan yang tepat termasuk di dalamnya perbaikan dosis dan bentuk pupuk. Fungi mikoriza yang diinokulasi melalui pupuk hayati menginfeksi akar membentuk hifa eksternal yang meningkatkan kemampuan tanaman dalam penyerapan unsur hara, sehingga pertumbuhan dan perkembangan tanaman inang menjadi lebih cepat. Penelitian ini bertujuan menganalisis pengaruh pengaplikasian pupuk hayati mikoriza powder dan granul dengan taraf dosis pemupukan NPK berbeda dalam meningkatkan fase vegetatif dan generatif tanaman bawang merah pada Regosol Dramaga, menilai tingkat infeksi akar serta jumlah dan jenis spora, dan menganalisis sifat kimia tanah P-total dan P-tersedia. Metode eksperimental dilakukan menggunakan Rancangan Acak Lengkap (RAL) faktorial, petak utama jenis mikoriza dan anak petak dosis pupuk anorganik. Kombinasi perlakuan yang diuji sebanyak 12 diulang enam kali sehingga total terdapat 72 polybag. Mikoriza powder dan granul nyata meningkatkan tinggi tanaman, jumlah daun, dan jumlah umbi bawang merah paling baik. Mikoriza granul lebih efisien menghasilkan bobot basah dan kering umbi tanaman bawang merah paling berat, serta memberikan pengaruh nyata tertinggi pada nilai P-tersedia tanah mencapai 35,0 ppm dibandingkan kontrol sebesar 21,2 ppm., The use of Regosol has not yet supported expectation of high production with low fertility and easy-to-wash nutrients. Increasing productivity of shallots is carried out through proper fertilization, including dosage and fertilizer forms. Mycorrhizal infect the roots to form an external hyphae that increase plant's ability to absorb nutrients, so that the growth and development of the host plant becomes faster. This research aims to analyze application of mycorrhiza powder and granule biofertilizer with different NPK dosage levels in increasing the vegetative and generative phases of shallot in Regosol Dramaga, assessing level of root infection, number and type of spores, and analyzing chemical of P-total and P-available soils. Experimental method was carried out using Factorial Completely Randomized Design (CRD), the main plot of mycorrhizal type and the subsidiary plot of inorganic fertilizer dosage. Combination of treatments tested was 12, repeated six times, there were a total of 72 polybags. Application of powder and granule mycorrhizal increases the best height, number of leaves, and number of bulbs. Granule mycorrhizal are more efficient in producing wet and dry weight of the heaviest onion bulbs, as well as giving highest P-available soil reaching 35,0 ppm compared to the control of 21,2 ppm.
Keyword: bawang merah, mikoriza, regosol

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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