Judul: Increasing Rice Yield with Application of Micro Fertilizer B and Zn
Abstrak: Produktivitas padi nasional mengalami penurunan dalam 5 tahun terakhir. Kurangnya pengelolaan hara mikro menyebabkan stagnansi produktivitas tanaman. Zinc (Zn) berperan dalam metabolisme auksin, sintesis klorofil, dan aktivasi enzim. Boron (B) berperan dalam perkembangan polen serta sintesis dan transport karbohidrat. Penelitian ini bertujuan mengetahui pengaruh pemupukan hara mikro B dan Zn terhadap pertumbuhan dan peningkatan hasil padi sawah. Penelitian ini dilaksanakan di Kebun Pendidikan Sawah Baru, Departemen Agronomi dan Hortikultura, IPB pada bulan November 2020 hingga April 2021. Rancangan percobaan yang digunakan adalah rancangan kelompok lengkap teracak (RKLT) dua faktor dengan tiga ulangan. Faktor pertama adalah pupuk zinc dengan 4 taraf dosis: 0 kg ha-1, 3 kg ha-1, 4,5 kg ha-1, dan 6 kg ha-1 yang diaplikasikan melalui daun pada 3, 5, dan 7 minggu setelah tanam. Faktor kedua adalah pupuk boron dengan 4 taraf dosis: 0 l ha-1, 0,3 l ha-1, 0,6 l ha-1, dan 0,9 l ha-1 yang diaplikasikan melalui daun pada 8 MST saat fase bunting dan 10 MST saat berbunga 10%. Hasil penelitian menunjukkan aplikasi pupuk B dan Zn tidak berpengaruh terhadap peubah vegetatif maupun komponen hasil dan hasil. Kebutuhan hara B dan Zn cenderung terpenuhi oleh kandungan B dan Zn pada tanah yang sudah tergolong tinggi. Pemupukan Zn cenderung dapat meningkatkan kandungan Zn pada jerami., National rice productivity has decreased in the last 5 years. Lack of micronutrient management causes stagnation of plant productivity. Zinc (Zn) plays a role in auxin metabolism, chlorophyll synthesis, and enzyme activation. Boron (B) plays a role in cell activity and pollen development also synthesis and transport of carbohydrates. The aims of this research to knows the effect of B and Zn micronutrient fertilization on the growth and increase in lowland rice yields. This research was conducted at Sawah Baru Teaching Farm, Department of Agronomy and Horticulture, IPB from November 2020 to April 2021. The experimental design used was a two-factor randomized complete block design (RKLT) with three replications. The first factor was zinc fertilizer with 4 dose levels: 0 kg ha-1, 3 kg ha-1, 4,5 kg ha-1, and 6 kg ha-1 applied through the leaves at 3, 5, and 7 weeks after transplanting. The second factor was boron fertilizer with 4 dose levels: 0 l ha-1, 0.3 l ha-1, 0.6 l ha-1, and 0.9 l ha-1 applied through the leaves 8 weeks after transplanting at booting stage and 10 weeks after transplanting at 10% flowering. The results showed that the application of B and Zn fertilizers had no effect on vegetative variables and yield and yield components. The nutrient needs of B and Zn tend to be met by the high content of B and Zn in the soil. Zn fertilization tends to increase the Zn content of straw.
Keyword: boron, foliar spray, zinc, zn content

Judul: Application of Zn Fertilization to Increase Yield and Concentration of Zn in Rice on Four Rice Varieties
Abstrak: Penelitian ini bertujuan untuk mendapatkan informasi tentang respon varietas terhadap Zn dalam pertumbuhan, komponen hasil dan kandungan Zn dalam beras pada padi varietas IPB 3S, Akita Komachi, Hipa 18, dan Inpari 42. Penelitian dilaksanakan di Kebun Percobaan IPB Sawah Baru, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, IPB pada Januari hingga Juli 2020, dilanjutkan di Laboratorium Pasca Panen, Laboratorium Uji dan Laboratorium Technopark hingga bulan Agustus 2020 Rancangan percobaan yang digunakan adalah rancangan split plot yang terdiri atas dua faktor yaitu varietas sebagai petak utama dan dosis pupuk Zn sebagai anak petak. Perlakuan varietas terdiri dari varietas IPB 3S, Akita Komachi, Hipa 18, dan Inpari 42. Perlakuan dosis Zn terdiri atas lima taraf dosis 0 kg ha-1, 4 kg ha-1, 8 kg ha-1, 12 kg ha-1 dan 16 kg ha-1. Satuan percobaan yang digunakan petakan seluas 25 m2. Hasil penelitian menunjukkan bahwa varietas memiliki karakter yang berbeda pada peubah yang diamati, meliputi seluruh peubah vegetatif, biomassa dan panen, kecuali peubah bagan warna daun lima MST, bobot basah akar dan tajuk fase vegetatif, dan volume akar fase panen. Aplikasi pupuk Zn berpengaruh nyata terhadap peubah persentase rendemen beras, beras kepala, beras pecah, dan beras menir. Perlakuan dosis pupuk Zn tidak berpengaruh terhadap pertumbuhan, hasil, komponen hasil maupun kandungan Zn dalam beras. Tidak terdapat respon yang berbeda antar varietas terhadap aplikasi dosis pupuk Zn, The objective of this research was to obtain information on the effect of Zn application on growth, crop yield and Zn content in rice grain of IPB 3S, Akita Komachi, Hipa 18 and Inpari 42. The research was conducted at Sawah Baru Experimental Field, Department of Agronomy and Horticulture, IPB University from January to July 2020, and at the Post-Harvest Laboratory, Test Laboratory and Technopark Laboratory until August 2020. The experimental design used in this research was split plot design with two factors, i.e. variety as main plot and dose of Zn fertilizer as subplot. The factor of variety consisted of IPB 3S, Akita Komachi, Hipa 18, and Inpari 42. The factor of Zn fertilizer dose consisted of five levels 0 kg ha-1, 4 kg ha-1, 8 kg ha-1, 12 kg ha-1 and 16 kg ha-1. The experimental unit was a plot of 25 m2. The result showed that variety has different characteristics on vegetative variables, harvest variables, and harvest biomass variables except on leaf index color on 5 WAT, root’s and shoot’s fresh weight in vegetative phase, and root’s volume at harvest. The application of Zn fertilizer affects the variable of milled rice percentage, head rice, broken rice and rice groats percentage. Application of Zn fertilizer didn’t affect growth, yield, yield component and Zn content on rice. There are no different responses between variety on application of Zn fertilizer.
Keyword: biofortification, micro nutrient, rice production, zinc

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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