Judul: Application of Micronutrients of Cu and Zn to Improve Growth of Maize and Sorghum in High-pH Soils
Abstrak: Permasalahan pertanian yang berkembang di Nusa Tenggara Timur yang memiliki pH tanah tinggi, iklim kering, dan topografi berbukit adalah kelangkaan air dan defisiensi unsur hara mikro. Berbagai praktek budidaya dapat dilakukan untuk mengatasi permasalahan tersebut diantaranya adalah pemanenan air hujan di waduk, pemupukanunsur hara mikro khususnya Cu dan Zn, serta pemilihan komoditas yang adaptif pada lahan kering. Unsur hara mikro hanya dibutuhkan dalam jumlah kecil pada tanaman oleh karena itu diperlukan teknik yang tepat untuk aplikasi yang efisien dan efektif. Pupuk dapat diaplikasikan di atas permukaan tanah atau disemprotkan ke daun tanaman (aplikasi daun) dalam bentuk EDTA atau Sulfat. Penelitian ini bertujuan untuk meningkatkan pertumbuhan dan mengetahui kandungan nutrisi pada jagung dan sorgum melalui aplikasi unsur hara mikro. Ada dua jenis unsur hara mikro (Cu dan Zn) berupa EDTA dan Sulfat yang diaplikasikan pada tanaman dalam percobaan di rumah kaca. Pertumbuhan jagung dan sorgum diamati selama masa vegetatif dan dipanen pada minggu kelima setelah tanam (WAP). Hasil penelitian menunjukkan bahwa aplikasi mikronutrien berupa EDTA dan Sulfat berpengaruh nyata terhadap pertumbuhan serta meningkatkan kandungan Cu dan Zn pada jagung dan sorgum. Aplikasi EDTA dan Sulfat dengan cara disemprotkan ke daun tanaman lebih baik daripada aplikasi di atas permukaan tanah. Hasil penelitian menunjukkan bahwa unsur hara mikro tersebut lebih sesuai untuk tanaman semusim seperti jagung dan sorgum. Namun tanaman dipanen pada akhir masa vegetatif pada penelitian ini sehingga pengaruhnya belum terlihat., Crop production problems in East Nusa Tenggara that has high soils pH, dry climate, and hilly topography, are water scarcity and micronutrients deficiency. Many cultivation practices can be conducted to solve those problems such as harvesting rain water on reservoirs, application of micronutrients especially Cu and Zn, and choosing adaptive commodities for dryland areas. Micronutrients are required only in small amounts therefore the right technique is needed for efficient and effective application. Fertilizer can be applied over the soil surface or sprayed on to plants’ leaves (foliar application) in EDTA or Sulfate form. This study was aimed to improve growth and determine nutrient content of corn and sorghum by application of micronutrients. There were two types of micronutrients (Cu and Zn) in the form of EDTA and Sulfate applied to plants in the greenhouse experiment. The growth of corn and sorghum were observed during the vegetative period and harvested on the fifth week after planting (WAP). The results showed that the application of micronutrients in the form of EDTA and Sulfate significantly influenced the growth and increased Cu and Zn content of corn and sorghum plants. Application of EDTA and Sulfate by spraying on to plants’ leaves was better than application over soil surface. The results showed that these micronutrients were more suitable for annual crops such as corn and sorghum. However, plants were harvested at the end of vegetative period in this study so that the effect has not been seen yet.
Keyword: Aplikasi Daun, EDTA, Nusa Tenggara Timur, Unsur mikro sulfat

Judul: Respon of Corn Varieties ( Zea mays L.) to Water Saturated Cultivation with the Application of Macro Micro Nutriens in Tidal Swamp Lnad
Abstrak: Budidaya jagung di lahan pasang surut memiliki banyak kendala yakni rendahnya unsur hara dan pH tanah yang sangat asam. Salah satu teknik budidaya untuk menangani kendala tersebut adalah dengan budidaya jenuh air. Selain itu, pemberian unsur hara makro mikro yang optimum dan penggunaan varietas yang toleran dapat meningkatkan produktivitas jagung. Penelitian ini bertujuan mengetahui respon pertumbuhan tanaman jagung (Zea mays L.) di berbagai varietas pada budidaya jenuh air dengan pemberian unsur hara makro dan mikro di lahan pasang surut. Penelitian dilaksanakan pada bulan Maret˗Agustus 2023 di Desa Karya Bakti, Kecamatan Rantau Rasau, Kabupaten Tanjung Jabung Timur, Jambi. Penelitian menggunakan rancangan faktorial RKLT. Faktor pertama adalah pemberian unsur hara makro dan mikro dengan 8 perlakuan yang terdiri dari: tanpa perlakuan atau kontrol (P1), pemberian N (P2), pemberian N dan P (P3), pemberian N, P, dan K (P4), pemberian NPK dan dolomit (P5), pemberian NPK, dolomit dan pupuk kandang (P6), pemberian NPK, dolomit, pupuk kandang dan Cu (P7), pemberian NPK, dolomit, pupuk kandang, Cu dan Zn (P8). Faktor kedua adalah varietas, yang terdiri atas: NK Sumo (V1) dan Pioneer 27 (V2). Terdapat 3 ulangan dengan 48 satuan percobaan. Data dibandingkan menggunakan uji F dan jika perlakuan berbeda nyata maka dilakukan uji lanjut DMRT pada taraf 5%. Hasil menunjukkan bahwa pemberian unsur hara makro lengkap menunjukkan hasil yang berbeda nyata pada setiap karakter pengamatan. Produktivitas varietas NK Sumo tidak berbeda nyata dengan Pioneer 27. Pemberian unsur mikro tidak berpengaruh nyata terhadap hampir semua karakter pengamatan., Cultivating corn in tidal land faces numerous challenges, such as low nutrient content and highly acidic soil pH. One cultivation technique to address these issues is through water-saturated soil cultivation. In addition, optimizing the application of macro and micronutrients, as well as using tolerant varieties can enhance corn productivity. This research aims to determine the growth response of corn plants (Zea mays L) in water-saturated soil cultivation using various varieties and applying macro and micronutrients in tidal land. The study was conducted from March to August 2023 in Karya Bakti Village, Rantau Rasau District, East Tanjung Jabung Regency, Jambi. The research employed a randomized factorial design (RKLT). The first factor involved the application of macro and micronutrients with 8 treatments: Control (P1), nitrogen application (P2), nitrogen and phosphorus application (P3), nitrogen, phosphorus, and potassium application (P4), NPK and dolomite application (P5), NPK, dolomite, and organic fertilizer application (P6), NPK, dolomite, organic fertilizer, and copper (Cu) application (P7), NPK, dolomite, organic fertilizer, copper (Cu), and zinc (Zn) application (P8). The second factor was the varieties: NK Sumo (V1) and Pioneer 27 (V2). There were 3 replications with 48 experimental units. Data were compared using an F-test, and if significant differences were found, a Tukey's Honestly Significant Difference (HSD) test was conducted at the 5% level. The results indicate that applying complete macronutrients significantly influenced each observed characteristic. The productivity of the NK Sumo variety did not significantly differ from Pioneer 27 variety. The application of micronutrients did not significantly affect nearly all observed characteristics.
Keyword: jagung, unsur hara, NK Sumo, Pioneer 27, produktivitas

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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