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Abstrak (Bhs. Indonesia)

Ketersediaan K dalam tanah yang optimal akan memberikan pengaruh peningkatan terhadap hasil tanaman. Penelitian yang telah dilakukan bertujuan untuk menentukan pola sebaran unsur hara Kalium (K) pada lahan sawah pertanaman padi di DAS Serayu, Kecamatan Susukan, Kabupaten Banjarnegara; menentukan sifat kimia tanah, serapan Kalium (K) dan hasil tanaman padi serta nilai korelasi antar variabel pengamatan pada lahan sawah pertanaman padi di DAS Serayu, Kecamatan Susukan, Kabupaten Banjarnegara; dan menentukan rekomendasi pemupukan Kalium (K) yang optimum untuk meningkatkan hasil tanaman padi pada lahan sawah di DAS Serayu, Kecamatan Susukan, Kabupaten Banjarnegara. Penelitian dilaksanakan pada Januari sampai dengan Mei 2023. Penentuan titik lokasi pengamatan berdasarkan peta SLH (Satuan Lahan Homogen) melalui overlay peta peggunaan lahan sawah, peta jenis tanah, dan peta kelerengan. Pengambilan sampel jaringan tanaman menggunakan daun ke-3 dan ke-4, sampel tanah pada kedalaman 0-25 cm dan 25-50 cm dan sampel biji menggunakan 3 malai dalam satu rumpun. Variabel penelitian meliputi pH H2O, pH KCl, Daya Hantar Listik (DHL) tanah, potensial redoks tanah, K-tersedia tanah, Serapan K tanaman, dan hasil tanaman padi. Data penelitian menunjukkan harkat K-tersedia sangat tinggi yaitu pada SLH 1 bernilai 1,43cmol(+)/kg. Korelasi K- tersedia dengan hasil tanaman mempunyai korelasi positif sangat lemah dengan nilai r = 0,111. Berdasarkan analisis regresi hubungan antar variabel K tersedia dengan hasil tanaman memiliki R2 = 0,0122 yang artinya hasil tanaman dipengaruhi oleh K-tersedia sebesar 1,22%. Serapan K dipengaruhi oleh K-tersedia sebesar 9,24%, sedangkan serapan K mempengaruhi hasil tanaman sebesar 9,88%. Rekomendasi pemupukan di lokasi penelitian diberikan pada harkat rendah ke sedang kebutuhan pupuk KCl 19,53 kg/ha dan pupuk KCl 58,60 kg/ha untuk harkat sedang ke tinggi.

Abtrak (Bhs. Inggris)

Optimum availability of K in the soil has an increasing effect on crop yields. The research was conducted carried out aims to determine the pattern of distribution of potassium (K) nutrients in paddy rice fields in the Serayu Watershed, Susukan District, Banjarnegara Regency; determine the chemical properties of the soil, Potassium (K) uptake and rice crop yields as well as the correlation value between the observed variables on yield of rice wetland; and determine the optimum Potassium (K) nutrient recommendations to increase of wetland rice in paddy fields in the Serayu Watershed, Susukan District, Banjarnegara Regency. The research was carried out from January to May 2023. Determination of observation points basin used a LU (Land Unit) map by overlaying it based on a paddy field land use map, a soil type map, and a slope map. Plant tissue samples were taken 3rd and 4th leaves of the rice plant, soil samples at a depth of 0-25 cm and 25-50 cm, and seed samples using 3 panicles in one clump. The variables observed in the study included pH H2O, pH KCl, soil Electrical Conductivity (EC), soil redox potential, soil available K, plant K uptake, and rice crop yields. Results show that the nutrient status of potassium has a very high rating namely at SLH 1 is worth 1.43 cmol(+)/kg. Correlation available K and crop yields weak positive correlation between available K and yield of rice with a value of r = 0.111. Based on the regression analysis of the relationship between available K variables and crop yields, R2 = 0.0122, which means that crop yields are affected by available K of 1,22%. K uptake is affected by available K by 9.24%, while K uptake affects plant yield by 9.88%. Recommendation fertilization at the study site is given at low to moderate levels according to needs KCl fertilizer 19.53 kg/ha and KCl fertilizer 58.60 kg/ha for medium to high grades.

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