Identifikasi Cekaman Abiotik Varietas Jagung akibat Pemberian Bahan Organik Jerami padi dan Biochar pada Tanah Ultisol

Abiotic stress is a limiting factor in maize production on Ultisols. One solution that can be done to overcome this problem through the selection of resistant corn varieties and by using organic matter as an amendment. The experiment tested effect abiotic growth consisted 10 (ten) treatments, namely: C0 (without drought stress/75% FC ), C1 (drought stress/37.5% FC), C2 phosphorus stress), C3 (phosphorus stress/ without phosphorus), C4 potassium C5 (potassium stress/without potassium), C6 magnesium C7 (magnesium magnesium), C8 (given matter) C9 matter). observed variables were number stomata, total chlorophyll content, cob dry weight, root shoot plant biomass weight. results showed had different response abilities deficiencies three macronutrients. This proven fact there difference ability stressed nutrients, namely P, K Mg. Corn has best adaptability Anoman I variety, variety highest stomata chlorophyll, heaviest biomass, while lowest nutrient because it shows low responses all agrophysological characters above Lamuru variety. identification 1 most sensitive Organic materials increase water deficiencies. seen from research where which shortages its after obtaining amendments rice straw biochar. In general, concluded stress, both (P, K, Mg) affected was significant interaction between varietal differences Ultisols.Key Woard : Varieties, Amendment, Nutrition Stress Ultisol Soil Water