Pengaruh Pemupukan Nitrogen, dan Waktu Tanam terhadap Serangan Penyakit Busuk Batang, Antraknosa, dan Hawar Daun pada Tanaman Sorgum (Sorghum Bicolor (L). Moench)

Abstract

Stem rot, anthracnose and leaf blight are diseases that often attack and result in reduced sorghum crop yields. Apart from that, the N element in plants also geatly influences the condition of sorghum plants as well as different planting times which determine the level of plant gowth and inflorescence production. The aim of this research was to determine the effect of nitrogen fertilization and planting time on stem rot, anthracnose and leaf blight in sorghum plants. This research was carried out on the land of PT. Tapian Asri International Jl. Letnan Jenderal (Letjend) Jamin Ginting, District. Pancur Batu, Medan, North Sumatra in May-September 2023. This research uses a Factorial Split Plot Design (RPT) with 2 factors: the first factor is 2 planting times, namely; T1: 2 May 2023, T2: 12 May 2023. The second factor is nitrogen fertilization with 5 levels of dosage, namely; N0 : 0 kg/ha Control, N1 : 55 kg/ha (167.4 g/plot), N2 : 90 kg/ha (274 g/plot), N3 : 125 kg/ha (380.5 g/plot) , N4 : 160 kg/ha (486.9 g/plot). The research results showed that applying nitrogen fertilizer had no significant effect on stem rot, anthracnose and leaf blight. Planting time had a significant effect on the percentage of stem rot disease attacks at 80 DAP, the percentage and the intensity of anthracnose attacks at 30 DAP, 40 DAP and 90 DAP, and had no significant effect on leaf blight disease. The interaction of planting time and nitrogen fertilization had a significant effect on the intensity parameters of anthracnose attacks at 50 DAP and 90 DAP and had no significant effect on stem rot and leaf blight.