The research was conducted at Asahan Regency, with flat topography. The study was conducted from March to April 2016. The materials used in this study were varieties of pakcoy varieties, Organic Dofosf G-21, old coconut water, water, Decis 2.5 EC insecticides, Dithane M-45 fungicides, and materials other materials that support the implementation of this research. The tools used in this research are hoe, gembor, meter, sprayer, calculator, scales, plot board and other supporting tools in conducting this research. This research was arranged based on Factorial Randomized Block Design (RAK) with 2 treatment factors and 3 replications. The first factor was the giving of Dofosf G-21 organic fertilizer with 4 levels: D0 = 0 g / plot (control), D1 = 28,8 g / plot, D2 = 57,6 g / plot and D3 = 86,4 g / plot. The second factor is old coconut water, with 3 levels ie K0 = 0 ml / plot, K1 = 125 ml / plot, and K2 = 250 ml / plot. The results of organic fertilizer Dofosf G-21 showed significant effect on the growth and production of mustard plant pakcoy. The provision of old coconut water has a significant effect on the growth and production of mustard plant pakcoy. The interaction between the application of organic fertilizer Dofosf G-21 and the provision of old coconut water to the growth and production of mustard plant pakcoy showed no significant effect on all parameters observed.

Mangroves have an ability in environmental conditions, i.e., in the sediment, and organs. This research was carried out to assess the Pb absorption rate (sediment and mangrove parts of R. apiculata) in the eastern coast of Asahan, North Sumatra. The results showed that Pb content increased in the sediment, but it significantly decreased in leaves. The highest Pb content was in the sediment > roots > fruits > stem bark > leaves. The PCA results of factor loading showed that in the sediment (0.98), roots (0.98), fruits (0.98), stem bark (0.74) and leaves (0.98). The bioaccumulation factor (BAF) and translocation factor (TF) were < 1 indicating that R. apiculata has a capability of heavy metal absorption, especially Pb. Pb had a positive correlation in the sediment and roots.

Mangroves of R. apiculata and A. marina have the ability and capability to absorb or bioaccumulate heavy metals. The purpose of this study was to determine and compare bioaccumulation of heavy metal Cd in A. marina and R. apiculata in the sediment and mangrove organ tissues. This research was conducted from March to August 2020 in the East Coast of Sumatra, Asahan Regency. Data analysis was carried out at the Aquaculture Study Program, Asahan University. The statistical analysis was performed using Principal Component Analysis (PCA) to examine the relationships and comparisons. The results showed that the Cd content in the mangrove sediment of A. marina was 0.05 ± 0 mg/kg) and R. apiculata was 0.03 ± 0 mg/kg.

The research plan was conducted at the Experimental Garden of the University of Asahan Faculty of Agriculture, with flat topography and high place ± 15 m asl. The research plan is carried out from February to April 2017. The materials used in this research are General varieties of lettuce seeds, urea fertilizer, liquid organic fertilizer of urban trash, water, envelopes, label paper, coconut bark as roof shade nursery, insecticide materials Active Deltamethrin 25 g / l (Decis 2.5 EC 0.25 -0.5 ml / l), Mankozed 80 WP (Dithane M-45) active material fungicide, scales and other materials supporting the conduct of this study, The tool used in this research is hoe, gembor, meter, handsprayer, calculator, scales, planimeter, wire as bamboo bamboo binder and other supporting tools in the implementation of this research. This research was arranged based on Factorial Randomized Block Design (RAK) with 2 treatment factors and 3 replications. The first factor was Urea fertilizer with 4 levels: U 0 = 0 g/plot, U 1 = 5 g/plot and U 2 = 10 g/plot and U 3 = 15 g/plot. The second factor is the provision of liquid organic fertilizer of municipal solid waste consisting of 3 levels ie K 0 = 0 ml/plot, K 1 = 0,15 ml/plot and K 2 = 0,30 ml/ plot. The results showed that urea fertilizer gave significant effect on the parameters of plant height, number of leaves, production per plant and production per plot, with best dose of U3 treatment (15 g/plot). Provision of liquid organic fertilizers of urban solid waste showed a significant effect on the parameters of plant height, number of leaves, production per production plant per plot, with the best dose on K2 treatment (0.30 ml / plot). The interaction between treatment of urea fertilizer and liquid organic fertilizer of urban solid waste did not show any significant effect on growth and production of lettuce Keywords: Urea Fertilizer, Organic Fertilizer, Municipal Wastewater, Growth, Lettuce ABSTRAKPenelitian rencana dilaksanakan di Kebun Percobaan Fakultas Pertanian Universitas Asahan, dengan topografi datar dan tinggi tempat ± 15 m dpl. Penelitian rencana dilaksanakan pada bulan Februari sampai bulan April 2017. Bahan-bahan yang digunakan dalam penelitian ini adalah bibit selada varietas General, pupuk urea, pupuk organik cair sampah kota, air, amplop, kertas label, pelepah kelapa sebagai atap naungan persemaian, insektisida bahan aktif Deltametrin 25 g/l (Decis 2.5 EC 0,25 -0,5 ml/l), fungisida bahan aktif Mankozed 80 WP , timbangan dan bahan-bahan lain yang mendukung pelaksanaan penelitian ini, sedangkan alat-alat yang digunakan dalam penelitian ini adalah cangkul, gembor, meteran, handsprayer, kalkulator, timbangan, planimeter, kawat sebagai pengikat bambu persemaian dan alat-alat lain yang mendukung dalam pelaksanaan penelitian ini. Penelitian ini disusun berdasarkan Rancangan Acak Kelompok (RAK) Faktorial dengan 2 faktor perlakuan dan 3 ulangan. Faktor pertama adalah pemberian pupuk Urea dengan 4 taraf yaitu : U 0 = 0 g/plot, U 1 = 5 g/plot dan U 2 = 10 g/plot dan U 3 = 15...

Penelitian ini disusun berdasarkan Rancangan Acak Kelompok (RAK) Faktorial dengan 2 faktor perlakuan dan 3 ulangan. Faktor pertama adalah pemberian nutrisi AB Mix (A) terdiri dari tiga taraf yaitu A1 = 1000 ppm/plot, A2 = 1500 ppm/plot, A3 = 2000 ppm/plot. Faktor kedua adalah variasi media tanam (M) terdiri dari 3 jenis yaitu M1 = Rockwool, M2 = Arang Sekam Padi + Serbuk Gergaji, M3 = Arang Sekam Padi + Cocopeat. Hasil penelitian pemberian Pemberian Pupuk Ab-Mix menunjukkan tidak berpengaruh nyata pada pengamatan tinggi tanaman, menunjukkan pengaruh nyata pada pengamatan jumlah daun, jumlah daun terbanyak yaitu konsentrasi AB Mix 1000 ppm/plot (A1) yaitu 40,22 helai. Menunjukkan tidak berpengaruh nyata pada pengamatan jumlah bunga, dan produksi pertanaman sampel, tetapi menunjukkan pengaruh nyata pada pengamatan produksi per plot, dengan produksi terbanyak yaitu pemberian konsentrasi AB Mix 1000 ppm/plot (A1) menunjukkan jumlah produksi yaitu 130,44 g. Pemberian berbagai jenis media tanam menunjukkan tidak berpengaruh nyata pada semua parameter amatan. Interaksi pemberian AB Mix dan media tanam menunjukkan tidak berpengaruh nyata pada parameter pengamatan tinggi tanaman, tidak menunjukkan pengaruh nyata pada parameter pengamatan jumlah daun 2 dan 6 MST, tetapi berpengaruh yata pada umur 4 MST, tidak menunjukkan pengaruh yang nyata pada parameter pengamatan jumlah bunga,  produksi per tanaman sampel dan produksi per plot