ABSTRAK
Tanah sulfat masam memiliki potensi untuk dikembangkan menjadi lahan produktif untuk pengembangan budidaya tanaman padi dengan input teknologi berbasis sumberdaya lokal. Dalam hubungan ini, penelitian dilaksanakan bertujuan untuk mengetahui pengaruh penggunaan limbah padi dan biomasa tumbuhan liar Chromolaena odorata L. terhadap pertumbuhan padi di tanah sulfat masam Sungai kakap Kalimantan Barat. Penelitian dilaksanakan di rumah kaca Fakultas Pertanian Unversitas Panca Bhakti Pontianak, selama 3 bulan. Hasil penelitan menunjukkan pemberian berbagai perlakuan limbah padi dan biomasa tumbuhan liar Chromolaena odorata baik tunggal maupun yang dikombinasikan, berpengaruh terhadap pertumbuhan padi. Hasil pertumbuhan terbaik diperoleh pada pemberian kombinasi Chromolaena odorata 10 t ha1 + limbah sekam padi yang diolah menjadi biochar 5 t ha1 dengan hasil; tinggi tanaman 88.83 cm, jumlah anakan 19.00, jumlah anakan produktif 12.00, bobot kering 94.23 g, dan volume akar 121.67 cm3.
Kata kunci: biochar sekam padi, biomasa tumbuhan Chromolaena odorata, pertumbuhan
padi, tanah sulfat masam

ABSTRACT
Acid sulphate soils have the potential to be developed into productive land for the development of rice cultivation with technology based on local resources. In this connection, the research carried out to determine the effect using of waste paddy rice and biomass wild species Chromolaena odorata L. on the growth of rice in acid sulphate soils Kakap River in West Kalimantan.
The research was conducted in the greenhouse of the Faculty of Agriculture, Panca Bhakti University Pontianak, for 3 months. The results showed the provision of various waste treatment paddy rice and biomass wild species Chromolaena odorata either singly or combined, affect the growth of rice. The best growth results obtained on administration of a combination of Chromolaena odorata 10 t ha-1 + waste of rice hulls is processed into biochar 5 t ha-1 with the results; 88.83 cm plant height, number of sprouts 19:00, number of productive sprouts 12:00, 94.23 g dry weight, and root volume of 121.67 cm3.
Keywords: rice hulls biochar, biomass wild species Chromolaena odorata, growing rice,
acid sulphate soil