MEASURES FOR INCREASING PRODUCTION GROWTH AND SWEET CORN ( Zea mays saccharata Sturt) ORGANIC LIQUID FERTILIZER APPLICATION THROUGH COW URINE AND COMPOST BUNCH EMPTY PALM OIL - Syofia, Irna; Universitas Muhammadiyah Sumatera Utara (JURNAL ILMU PERTANIAN "AGRIUM", 2016)