Judul: Correlation of Soil Available Micronutrients and Micronutrient Uptake of Corn Fertilized with Micronutrients
Abstrak: Salah satu cara memperbaiki ketersediaan hara mikro dan meningkatkan hasil jagung adalah dengan pemupukan hara mikro sesuai dengan kebutuhan tanaman. Tujuan penelitian ini adalah untuk memperoleh koefisien korelasi antara hara mikro tersedia dalam tanah dan serapan hara mikro jagung berdasarkan dua metode analisis hara mikro tersedia tanah dan menguji pengaruh hara mikro pada pertumbuhan dan hasil jagung manis. Rancangan acak kelompok dengan 8 perlakuan dan 4 kelompok digunakan dalam percobaan pemupukan hara mikro ini. Perlakuan terdiri dari 4 taraf pupuk mikro (PM) yaitu Kontrol (tanpa PM), ½ PM, 1 PM dan 1 ½ PM, dikombinasikan dengan ¾ dan 1 dosis standar (STD) pupuk mineral dan perlakuan pupuk mineral standar tanpa PM. Hasil percobaan menunjukkan bahwa hubungan antara Cu, Zn, Fe, dan Mn tersedia tanah berdasarkan metode analisis DTPA dengan serapan hara mikro yang sama oleh jagung mempunyai koefisien korelasi (r) lebih tinggi dan nyata dibandingkan dengan koefisien korelasi metode analisis EDTA. Pengaruh perlakuan hara mikro pada variabel tinggi tanaman pada umur 8 minggu setelah tanam menunjukkan bahwa perlakuan 1 STD + ½ PM menunjukkan tinggi tanaman tertinggi dan nyata lebih tinggi dibandingkan perlakuan kontrol dan standar (STD). Perlakuan 1 STD + 1 PM menunjukkan bobot tongkol jagung tertinggi, nyata lebih tinggi dibandingkan kontrol, namun tidak berbeda nyata dibandingkan perlakuan lainnya. Nilai efektivitas agronomik relatif (RAE) perlakuan 1 STD + ½ PM dan 1 STD + 1 PM berturut turut 112.5% dan 113.2% yang menunjukkan kenaikan 12.5% dan 13.2% bobot tongkol jagung akibat perlakuan ½ dan 1 dosis pupuk mikro dibanding perlakuan pupuk mineral dosis standar tanpa pupuk mikro. Kata kunci : DTPA, EDTA, hara mikro, koefisien korelasi, One way to improve the availability of micronutrients and increase maize yields is by fertilizing micronutrients according to plant needs. The aim of this study was to obtain the correlation coefficient between available micronutrients in soil and maize nutrient uptake based on two soil available micronutrient analysis methods and examine the effect of micronutrients on the growth and yield of sweet corn. A randomized block design with 8 treatments and 4 groups was used in this micronutrient fertilization experiment. The treatment consisted of 4 levels of micro fertilizer (PM), namely Control (without PM), ½ PM, 1 PM and 1 ½ PM, combined with ¾ and 1 standard dose (STD) of mineral fertilizer and standard mineral fertilizer treatment without PM. The experimental results showed that the relationship between Cu, Zn, Fe, and Mn available in soil based on the DTPA analysis method with the same micronutrient uptake by corn had a higher and more significant correlation coefficient (r) compared to the correlation coefficient of the EDTA analysis method. The effect of micronutrient treatment on variable plant height at the age of 8 weeks after planting showed that the 1 STD + ½ PM treatment showed the highest plant height and was significantly higher than the control and standard treatment (STD). The 1 STD + 1 PM treatment showed the highest corn cob weight, significantly higher than the control, but not significantly different from the other treatments. The relative agronomic effectiveness (RAE) values of 1 STD +
Keyword: DTPA, EDTA, hara mikro, koefisien korelasi

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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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