Sifat fisik tanah merupakan sifat tanah yang berpengaruh terhadap pertumbuhan dan poduksi tanaman karena akan menentukan penetrasi akar di dalam tanah, kemampuan tanah menahan air, drainase, aerasi tanah dan ketersediaan unsur hara tanah. Penelitian ini bertujuan untuk mempelajari dan mengetahui karakteristik sifat fisik yang terdapat pada lahan yang berproduksi rendah dan tinggi. Penelitian dilaksanakan dari bulan Juni sampai September tahun 2013 diPT Great Giant Pineapple (GGP), Lampung Tengah. Penelitian dilakukan dengan menggunakan metode survey dengan menentukan titik sebanyak 6 titik secara diagonal pada lokasi 26 B. Pengambilan sampel tanah dilakukan dengan 2 cara, yaitu mengambil sampel tanah secara langsung dengan menggunakan cangkul dan pengambilan menggunakan ring sampel dengan kedalaman 0 – 20, 20 – 40 dan 40 – 60 cm serta pada setiap titik dilakukan pembuatan minipit yang bertujuan untuk mengamati profil dan warna tanah. Hasil penelitian menunjukkan bahwa Karakteristik sifat fisik pada lahan produksi rendah memiliki pori drainase sangat rendah sampai dengan sedang, warna tanah coklat kekuningan, tekstur tanah liat berpasir, kekuatan tanah 77,35 psi – 178,89 psi dan kerapatan isi idealpertumbuhan akar dari kedalaman 0 – 40 cm yaitu sebesar 1,36 g cm -3 pada kedalaman 0 – 20 cm dan 1,41 g cm -3 pada kedalaman 20 – 40 cm. Sedangkan Karakteristik sifat fisik pada lahan produksi tinggi memiliki pori drainase sangat rendah sampai dengan sedang, warna tanah orange, tekstur tanah liat berpasir, kekuatan tanah 96,69 psi – 125,70 psi dan kerapatan isi ideal pertumbuhan akar dari kedalaman 0 – 60 cm yaitu sebesar 1,29 g cm -3 pada kedalaman 0 – 20 cm, 1,38 g cm -3 pada kedalaman 20 – 40 cm dan 1,45 g cm -3 pada kedalaman 40 – 60 cm.
This study compared N HNO3 to other methods to determine plant available heavy metals in heavy-metal polluted soils. Soil samples were obtained from an experimental field treated with industrial waste after 22 years of the amendment and employed to conduct the comparative and correlation study. Soil samples were analyzed for Cu using various methods, planted in a glass house with several plants, and analyzed for soil and plant Cu and Zn. The relative strength of the chemical extractants followed the order of N HNO3 ≈ N HCl > Buffered DTPA ≈ Unbuffered DTPA > M CaCl2 ≈ N NH4OAc pH 7. A high correlation was observed for soil extracted Cu by M CaCl2 or N NH4OAc pH 7 or N HCl vs. Buffered DTPA and N HNO3 or N NH4OAc pH 7 vs. N HCl. High correlations of plant and soil Cu extracted by N HNO3 were shown by caisim, water spinach, land spinach, and corn, while plant and soil Zn were shown by caisim, water spinach, land spinach, and lettuce.
West Lampung Regency still survives as the central area of coffee production in Lampung Province while production of other districts so far are declining. This research aims to study the ethno-agronomy of coffee cultivation in West Lampung which is tolerant to rainfall variability. This research was a survey located in Sumberjaya District and Sekincau District, West Lampung Regency, Lampung Province, Indonesia year 20182019 which from each subdistrict two villages was selected purposively and from each village one farmer group was chosen. Primary data were collected through interview, Focused Group Discussion (FGD), and observation of coffee farm. Secondary data were obtained from the BPS Lampung and rainfall data from Radin Intan Climate Station. The results showed that the area of coffee plantations in West Lampung in the last decade has decreased by 0,64% per year but productivity has increased by 1,42% per year, and in West Lampung, which is a mountainous region, the number of rainy days was negatively correlated with coffee yield while the number of dry months was positively correlated. Whereas in North Lampung, which is a medium elevation area, coffee productivity correlated with sufficient rainfall and productivity was negatively correlated with the number of dry months of the previous year. Coffee farmers in West Lampung have perception the need for various adaptation measures of coffee farm maintenance, which grafting adult coffee tree with superior local robusta clones is a typical ethno-agronomy practiced by coffee farmers in West Lampung to obtain high coffee yield.
Nanas (Ananas comosus) membutuhkan air untuk pertumbuhannya yang maksimal. Salah satu upaya untuk mempertahankan kadar air dan suhu tanah saat musim kemarau yaitu dengan cara penambahan mulsa organik di atas permukaan tanah agar memperbaiki kondisi fisik tanah lapisan atas untuk menjaga temperatur (suhu), penguapan dan kadar air tanah, sehingga kadar air tanah dapat tersedia dan lebih hemat. Penelitian ini bertujuan untuk mengetahui pengaruh mulsa organik terhadap perubahan kadar air dan suhu tanah pada pertanaman nanas di PT Great Giant Pineapple Terbanggi besar Lampung Tengah. Penelitian ini disusun dalam rancangan acak lengkap (RAL), dengan perlakuan M0 = Tanpa mulsa, M1 = 25 t ha-1. M2 = 50 t ha-1. M3 = 75 t ha-1. M4 = 100 t ha-1. Mulsa organik yang digunakan pada penelitian ini adalah mulsa kulit singkong dengan kadar air 37,28%, bibit nanas yang digunakan adalah bibit Sucker Klon GP3.Perlakuan M0 setelah hari ke-3 yaitu kadar air mencapai 20,83 % harus dilakukan irigasi. Sedangkan pada perlakuan M1 hari ke-3 kadar air mencapai 21,8 % harus dilakukan proses irigasi. Perlakuan M2 setelah dilakukan pengamatan pada hari ke-7 dengan kadar air sebesar 21,18%, sehingga harus dilakukan proses irigasi. Perlakuan M3 setelah dilakukan pengamatan pada hari ke-10 yaitu dengan kadar air tanah mencapai 22,4%, sehingga harus dilakukan proses irigasi, sedangkan M4 pada hari ke-10 kadar air menjadi 22,56 %, sehingga sudah harus dilakukan proses irigasi. Maka, penelitian ini yang mampu bertahan lebih lama dalam memenuhi kebutuhan air pada perlakuan M3 dan M4 yaitu dapat bertahan selama 10 hari.
This research aimed to evaluate the residual Cu and Zn in tropical soil over 21 years after amendment with industrial waste, lime, and compost. Soil samples were collected from a well-maintained experimental field amended one time with industrial waste high in Cu and Zn set in 1998 at about 1.5–20 years after amendment. Treatments were arranged in a randomized block design with a metal-wares industrial waste at rates 0, 15, and 60 Mg·ha−1, lime at 0 and 5 Mg·ha−1, and compost at 0 and 5 Mg·ha−1. Soil samples were also taken vertically in the exact plot centers at depths of 0–75 cm of plots not amended with lime and compost and also from topsoils (0–15 cm) at 90 points with distances 50 cm between each other in each of the respective plots 21 years after amendment. Significant increases in Cu and Zn caused by waste were observed over 21 years. The increase in soil pH by lime was observed over 10 years but its effect in decreasing Cu and Zn was observed only at 1.5 years, particularly in topsoils. However, the effect of lime in lowering Cu and Zn was observed over 20 years when waste and/or compost were also given. Similarly, the effect of compost was absent over 20 years but significant when waste and/or lime were also given. The relative concentration of Cu and Zn in the 60 Mg waste ha−1 plots decreased over 20 years to 17–53% for Cu and to 12–33% for Zn; their concentrations were, in general, lower with lime and/or compost addition. The relative concentrations of Cu and Zn significantly decreased over 21 years in plots with 15 or 60 Mg·ha−1 and increased in the control plots. Heavy metals moved in soil significantly through soil tillage and erosion and partially by leaching.
Global climate change triggered the heavy and extreme rainfall in forms of intensity, pattern, duration, amount, and frequency. This condition strongly influences the occurrence of soil erosion, especially in the humid tropic region. The purpose of this research is to analyse the soil erosion rate under pineapple cultivation in Central Lampung, Indonesia. The results show rainfall erosivity using Bols equation is around 2109-3211 metric ton/h/ha. Soil erodibility is ranging 0.007-0.080 was categorized low to very low due to the amount of sand and silt is too low. The Slope also categorized low around 1-4%. The crop factor value is around 0.01-1. The rate of erosion in pineapple was 2016 is 1.51 ton/ha/year until 15 ton/ha/year; that value is under standard permissible erosion (18.5-25 ton/ha/year).
Penelitian ini bertujuan untuk mengetahui pengaruh kemantapan agregat tanah terhadap hasil produksi. Penelitian ini dilaksanakan dari bulan september sampai pada bulan Juli 2015 di PT Great Giant Pineapple (PT. GGP). Lampung Tengah. Penelitian ini mengunakan metode survei. Untuk pengambilan sampel dilakukan secara langsung di PT. GGP pada lokasi lahan 26B produksi rendah dan produksi tinggi. Lokasi 26B mempunyai luas lahan kurang lebih 8,30 ha dan terbagi menjadi 2 petak yang dipisahkan oleh jalan. Penentuan titik sampel secara diagonal,masing-masing di ambil 3 titik di lahan produksi rendah dan produksi tinggi. Pembuatan minipit dibuat untuk menentukan warna tanah dan pengambilan sampel tanah diseetiap titik, pengambilan contoh tanah diambil disetiap kedalaman dari 0-20, 20-40, 40-60. analisis contoh tanah dilakukan di Laboratorium Ilmu Tanah, Jurusan Agroteknologi, Fakultas Pertanian, Universitas Lampung untuk mengetahui sifat fisik tanah. Untukperlakuan analisis sampel tanah dipisahkan disetiap kedalaman, sehingga diperoleh 1 titik ada 3 sampel tanah pada kedalaman 0-20, 20-40, 40-60 dan pengambilan sampel tanah ada sebanyak 6 titik, 3 titik produksi rendah dan 3 titik di produksi tinggi sehingga jumlah sampel keseluruhan ada 18 sampel tanah. Tanah sebelum dianalisis dilakukan pengeringan udara sela 1-2 hari, hal ini dilakukan untuk mendapatkan kapasitas lapang. Untuk menentukan kelas kemantapan agregat perlu dilakukananalisis dengan menggunakan metode ayakan kering dan basah, dan didapatkan nilai RBD pengayakan kering dan RBD pengayakan basah. Kemudian dilakukan perhitungan indeks kemantapan agregat dan hasil nilai dari indeks kemantapan agergat dimasukan kedalam klasifikasi kemantapan agregat untuk mengetahui hasil sampel tanah masuk dalam kelas kemantapan mantap atau tidak mantap. Hasil penelitian menunjukkan bahwa pada lokasi lahan 26B baik yang produksi rendah maupun produksi tinggi sama-sama mempunyai kemantapan agregat sangat mantap.
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