Daun alang-alang (Imperata cylindrica L.) dapat digunakan sebagai mulsa organik yang mendukung pertumbuhan tanaman jagung melalui penghambatan pertumbuhan gulma dan juga menambah bahan organik tanah. Namun alelopati alang-alang dapat beresiko mengnganggu perkecambahan biji jagung. Oleh karena itu evaluasi pengaruh alelopati daun alang-alang perlu dilakukan untuk menghindari efek negatifnya pada tanaman jagung. Tujuan dari penelitian ini adalah untuk mengetahui effek alelopati daung alang-alang terhadap perkecambahan dan pertumbuhan awal biji jagung. Perlakuan pada penelitian ini yaitu pervedaan konsentrasi ekstrak daun alang-alang dan varietas jagung. Konsentrasinya meliputi 0, 7, 14, 21g/ml dan varietas jagung menggunakan Madura 1 and Madura 3. Parameter yang diamati dalam penelitian ini meliputi persentase perkecambahan, laju perkecambahan, panjang tanaman dan panjang akar. Seluruh perlakuan menunjukkan hasil yang significant terhadap semua parameter kecuali laju perkecambahan. Hasil pertumbuhan dan perkecambahan terendah ditunjukkan pada konsentrasi 21g250ml dan varietas Madura 3 menunjukkan hasil yang lebih baik dari Madura 1.

Cogongrass (Imperata cylindrica L.) can be used organik muclh that has impove the growth and crop of maize, such as inhibit weed growth and also increase organic matter in soil. Neverthless it allelopathic effect may have risk to inhibit germination of maize seed. Therefore evaluation allelopathic effect of cogongrass leaf must be carried out to prevent negative effect allelopathic effect of cogongrass on maize crop. The aim of this research is to get know allelopathic effect of cogongrass leaf to germination and early growh of maize seed gemination. Conducted treatments in this research were difference concetration of cogongrass leaf exctract and maize seed varieties. The concentrations were 0, 7, 14, 21g/ml and the seed varieties were Madura 1 and Madura 3. Obserbed parameters in this research were percentage germination, germination rate, seedling height and root lenght. The treatments revealed significant results on all parameters except rate germination. The lowest growth and gerimination maize seed which found on 21g/ml concentration exctract and Madura 3 variety showed better results than Madura 1.

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