Judul: Pengamh cara inkubasi, pengapuran dan pemupukan fosfor terhadap tanaman jagung ( Zea ntays L. ) pada tanah Hapludult ( Podsolik ) Gajrug
Abstrak: The aim of this research are to study the methods of phosphorus fertilization on any lime doses and the lime and phosphor incubation method on corn plant ( Zen mays L. ) on Hapludult ( Podsolik Gajrug ). Experimental design used in this research is Split Plot Design with lime factors on 4 grade as follow KO= Ox, K1= 25%, K2= 50% equal to exchangeable-Al, 100% equal to exchangeable-At, and with phosphorus factors on 1.24 g and K3 = TSPIpot, 3.37 g rock phosphatelpot, and 1.04 g mono-calcium phosphatelpot equal to 50 ppm P application. Initial fertilizer used are ZA with 100 ppm N doses (2.4 g ZAIpot) and KC1 with 100 ppm K doses (1 g KCVpot). Duncan test was established whether to understand the effect of each treatment or combination of some treatment. The lime treatment which was done earlier then incubated for one week are significantly higher to the lime and phosphorus fertilization that were done at the same time but incubated for two weeks on the corn dry mass and pH. Content and uptake of phosphorus in the second incubation are higher than the first incubation. Lime increasing doses significantly increase the corn dry mass, pH and phosphor uptake but decrease the exchangeable-Al. The treatment of 25% lime equal t o exchangeable-Al cause the highest plant phosphorus content compare to no lime, 50% lime application, and 100% lime application equal to exchangeable-Al treatment. Lime treatment did not give significant effects to the CEC and available P. The phosphate mono-calcium treatment significantly higher than TSP and rock phosphate on pH value. The phosphate mono-calcium treatment cause higher plant phosphorus content and phosphorus uptake compare to the TSP and rock phosphate treatment. Treatment of TSP, rock phosphate and phosphate monocalcium were not significantly different on corn plant dry weight, exchangeable Al, CEC and available phosphate. The treatment of 100% lime equal to exchangeable-& that was done earlier then add by TSP significantly higher than other combination treatments to the corn dry mass. The treatment of 100% lime equal to exchangeable-& that was done earlier then add by rock phosphate significantly increase pH value higher than other combination treatments. Combination treatment on 100% lime equal to exchangeable-& with TSP that were done on the same time gave the lowest pH value compare to other combination treatment.
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Judul: Pengaruh cara inkubasi, pengapuran dan pemupukan fosfor terhadap tanaman jagung (Zea mays L.) pada tanah hapludult (podsolik) Gajrug
Abstrak: Kendala utama dalam pengembangan tanaman jagung pada lahan kering di Indonesia adalah produksinya yang rendah dan menurun yaitu dengan rata-rata produksi nasional 1,8 ton/ha. Upaya untuk mengoptimalkan pertumbuhan tanaman dapat dilakukan dengan meningkatkan kesuburan tanah melalui pemberian input kedalam tanah. Penggunaan kapur dan pupuk fosfor merupakan salah satu tindakan alternatif untuk mengatasi masalah pertanian dilahan kering. Tujuan penelitian ini untuk mempelajari pemberian pupuk fosfor pada berbagai dosis kapur dan mempelajari cara inkubasi kapur dan pupuk fosfor terhadap tanaman jagung (Zea mays L.) pada tanah Hapludult (Podsolik) Gajrug. Rancangan percobaan yang digunakan dalam penelitian ini yaitu rancangan split plot dengan faktor yang dicobakan adalah kapur terdiri dari 4 taraf K00, K1 = 25% setara Al-dd, K2 50% setara Al-dd, K3 = 100% setara Al-dd dan pupuk fosfor dengan dosis 1,24 g TSP/pot, 3,37 g fosfat alam/pot dan 1,04 g monokalsium fosfat/pot yang setara dengan pemberian 50 ppm P. Pupuk dasar yang digunakan berupa ZA dengan dosis 100 ppm N (2,4 g ZA/pot) dan KCl dengan dosis 100 ppm K (1 g KCl/pot). Untuk mengetahui pengaruh dari tiap perlakuan maupun kombinasi dari beberapa perlakuan dilakukan uji lanjut Duncan. ..dst
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Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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