Judul: Evaluasi Status Hara Tanaman Jagung (Zea Mays) Menggunakan Metode Dris Osis Recommendation Integrated System) Dan Cnd (Compositional Nutrient Diagnosis)
Abstrak: Maize is one of the most important crops, besides wheat and rice. The increasing demand for maize should be balanced by the increase of production of maize. Therefore, one of the efforts is to improve soil fertility. One way to improve soil fertility is by evaluating the nutrients content in the leaf tissue leading to diagnose nutrient deficiency in the soil. It could be done by Diagnosis Recommendation Integrated System (DRIS) method. The objectives of this research were 1) to determine the DRIS and CND norms, 2) to assess the nutrient status of maize using DRIS method, 3) to compare DRIS method with critical nutrient level method, nutrient sufficiency range method and Compositional Nutrient Diagnosis (CND) method and 4) to reveal correlation value between DRIS method and CND method. The research consisted of 36 samples of high subpopulation and 148 samples of low subpopulation. These two populations were significantly different in all nutrient ratios except Ca/Mg and KIP, tested by F-test and t-test. Norm DRIS were 8.9 for NIP, 1.2 for NIK, 5.33 for N/Ca, ILOO for NlMg, 7.99 for KIP, 4.71 for KlCa, 10.04 for KlMg, 0.59 for PICa, 1.27 for PlMg and 2.26 for CalMg. Norm CND were 0.41 for N, -1.77 for P, 0.26 for K, -1.23 for Ca and -1.98 for Mg. Progressively diagnosis to nutrient concentration in DRIS method showed that the change of production was followed by the change of nutrient index value. For example 8.70 kwlha (maize production in control treatment) to 50.15 kwlha (maize production in 300-200-150 treatment) was followed by the change of N index from -14 to 2, P index from -15 to 1 and K index from -10 to 1. The order of nutrient deficiency changed from P>N>K>Ca>Mg to Ca>P>N>K>Mg. The order' of nutrient deficiency could not be described by using critical nutrient level and nutrient sufficiency range methods. This methods showed only the values of nutrient deficiency level without shown the nutrient deficiency order. In addition, the increasing production was also indicated by the decrease of Nutrient Balance Index (NBI) value. For example 8.7 kwlha (maize production in control treatment) to 50.15 kwlha (maize production in 300-200-150 treatment) was followed by the change of NBI value from 79 to 17. The similar result was shown by CND method. The positive correlation (R2= 0.9245) between DRIS and CND method was revealed. Combination leaf fertilizer to conventional fertilizer improved production and nutrient content in maize than conventional fertilizer used only. The result suggested that DRIS method was better in evaluating the result of plant analysis than that of critical nutrient level and nutrient deficiency range. Moreover DRIS was positively correlated with CND method.
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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: Penegakkan hukum dalam penanganan perampokan bersenjata (armed robbery) terhadap kapal laut di alur pelayaran internasional Selat Malaka
Abstrak: Selat Malaka adalah sebuah selat yang terletak di antara Semenanjung Malaysia di Malaysia, Pulau Sumatra di Indonesia, dan bergabung di bagian ujung sebelah selatan di Singapura. Selat Malaka dari segi ekonomi dan strategis merupakan salah satu jalur pelayaran terpenting di dunia.
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