SETYAJI, Arie (2017) Evaluasi Status Kesuburan N, P dan K Tanah Sawah pada Berbagai Jenis Tanah di Kecamatan Buluspesantren Kabupaten Kebumen. Skripsi thesis, Universitas Jenderal Soedirman.

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Abstract

Fertility status of n, p and k is essential for the productivity of paddy fields, because the effect on rice production. Crop cultivation action in paddy soil affects the growth and results. These actions can be applied such as: cropping, tillage, addition of irrigation water, fertilization and influence of cultivation. This research aims to determine 1) n paddy soil fertility of status on the various types of soil, 2) p paddy soil fertility of status on the various types of soil, and 3) k paddy soil fertility of status On the various types of soil in buluspesantren district kebumen regency. The research was conducted in paddy fields buluspesantren district of kebumen regency. The research was conducted from november 2016 to march 2017. The total area paddy fields under study is 2089 ha. Determination method and sampling carried out in accordance extents proportional sampling soil type. Determination of the amount sample points are based on level of accuracy that is the level of semi-detailed maps with a scale of 1: 25,000. In accordance such precision that each of 100 ha paddy fields is represented by one sample of observation. Based on those ordinances was obtained 21 sample of are spread on various types of soil that exist in the study area. The soil sampling conducted by using a composite drill the soil at a depth of 20 cm based on the percent area of the existing soil type. The bserved variables are the levels of total-n, available-n, total-p, available-p, totalk, available-k, C/n ratios and soil organic Matter. The results showed that the levels of total-n ranged from 0,06 up to 0,17%, available-n ranged from 56 up to 143 ppm, total-p ranged from 20 up to 167 Mg/100g, available-p ranged from 2 up to 118 ppm, total-k ranged from 3 up to 62 Mg/100g, available-k ranged from 24 up to 234 ppm, c/n ratio ranged from 6,3 up to 10,0 and soil organic matter ranged from 0,75 up to 2,61%. Keyword: paddy soil, fertility status npk Status kesuburan N, P dan K sangat penting bagi produktivitas lahan sawah, karena berpengaruh terhadap produksi padi sawah. Tindakan budidaya tanaman pada tanah sawah mempengaruhi pertumbuhan dan hasilnya. Pada tindakan tersebut dapat diterapkan seperti: pola tanam, penambahan air irigasi, pemupukan, pengaruh cara budidaya. Penelitian ini bertujuan untuk mengetahui 1) status kesuburan N tanah sawah pada berbagai jenis tanah, 2) status kesuburan P tanah sawah pada berbagai jenis tanah, dan 3) status kesuburan K tanah sawah pada berbagai jenis tanah di Kecamatan Buluspesantren Kabupaten Kebumen. Penelitian dilaksanakan di lahan sawah Kecamatan Buluspesantren Kabupaten Kebumen. Penelitian dilaksanakan dari bulan November 2016 sampai Maret 2017. Luas total lahan sawah yang diteliti adalah 2089 ha. Metode penetapan dan pengambilan sampel dilakukan secara proporsional sampling sesuai luasan jenis tanahnya. Penentuan jumlah titik sampel didasarkan pada tingkat ketelitian peta yaitu tingkat semi detail dengan skala peta 1:25.000. Sesuai dengan ketelitian tersebut maka setiap 100 ha lahan sawah diwakili oleh 1 sampel pengamatan. Berdasarkan tata cara tersebut diperoleh 21 sampel yang tersebar pada berbagai jenis tanah yang ada di wilayah kajian. Pengambilan sampel tanah dilakukan dengan menggunakan bor tanah secara komposit pada kedalaman 20 cm berdasarkan persen luasan jenis tanah yang ada. Variabel yang diamati adalah kadar N-total, N-tersedia, P-total, P-tersedia, Ktotal, K-tersedia, C/N Rasio dan bahan organik tanah. Hasil penelitian menunjukkan bahwa kadar N-total berkisar antara 0,06% sampai dengan 0,17%, N-tersedia berkisar antara 56 ppm sampai dengan 143 ppm, Ptotal berkisar antara 20 mg/100g sampai dengan 167 mg/100g, P-tersedia berkisar antara 2 ppm sampai dengan 118 ppm, K-total berkisar antara 3 mg/100g sampai dengan 62 mg/100g, K-tersedia berkisar antara 24 ppm sampai dengan 234 ppm, C/N Rasio berkisar antara 6,3 sampai dengan 10,0 dan Bahan organik tanah berkisar antara 0,75% sampai dengan 2,61%. Kata Kunci: Tanah Sawah, Status Kesuburan NPK.

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