Kajian Sifat Kimia Tanah Sawah Di Kecamatan Sunggal Kabupaten Deli Serdang : Studying on Chemical Properties of Paddy Soil In Sunggal Sub District Deli Serdang Regency

This study aimed to analyze and determine the chemical properties of paddy soil in the Sunggal sub district so that it can be determined Sunggal paddy soil fertilizer recommendations. Research using surveys with sampling techniques stratified random sampling based on the type of rice fields Rainfed and Irrigation and data analysis pH with methods Elektrometri, C organic method of Walkley and Black, the N total with methods Kjeldhal, P available by the method of Bray II, cations base (K+,Na+,Ca2+,Mg2+)by the method of extraction of NH4OAc 1N pH 7, CEC with NH4OAc 1 N pH 7 extraction method and Base Saturation with the calculations. Results of research on the soil for rainfed and irrigation showed that the pH of dominant soil slightly acid, organic C dominant low, N total is low, P available predominantly very low, K exchange dominant low, Ca exchange is low, Mg exchange the dominant medium, Na exchange low dominant, dominant CEC being, Base Saturation is very low dominant. Soil fertility status of rainfed and irrigation is relatively very low to low, except in rainfed Puji Mulyo village were moderate due to high organic C.   Penelitian ini bertujuan untuk menganalisis dan mengetahui sifat kimia tanah sawah yang ada di Kecamatan Sunggal sehingga dapat ditentukan rekomendasi pemupukan tanah sawah. Penelitian menggunakan metode Survei dengan teknik sampling Stratified Random Sampling berdasarkan jenis sawah Tadah Hujan dan Irigasi dan analisis data pH dengan metode Elektrometri, C organik metode Walkley and Black, hara N total dengan metode Kjeldhal, P tersedia dengan metode Bray II, Kationkation basa (K+, Na+, Ca2+, Mg2+) dengan metode Ekstraksi NH4OAc 1N pH 7, KTK dengan metode Ekstraksi NH4OAc pH 7 serta KB dengan perhitungan. Hasil penelitian pada tanah sawah tadah hujan dan irigasi menunjukkan bahwa pH tanah dominan agak masam, C organik dominan rendah, N total tergolong rendah, P tersedia dominan sangat rendah, K tukar dominan rendah, Ca tukar tergolong rendah, Mg tukar dominan sedang, Na tukar dominan rendah, KTK dominan sedang, KB dominan sangat rendah. Status kesuburan tanah sawah tadah hujan maupun irigasi tergolong sangat rendah hingga rendah, kecuali di sawah tadah hujan desa Puji Mulyo tergolong sedang akibat C organik tinggi.