Responses of Photosynthetic, Agronomic Traits, and Yields to Different Nitrogen Regimes in Juice Sugarcane cv. Suphanburi 50 in Low-Fertility Soil

Correlation showed that Fv′/Fm′ (r = 0.55∗) and E (r = 0.49∗) positively correlated with cane yield at harvest. Several agronomic traits correlated with cane yield, including tiller number at 4 MAT (r = 0.51∗), and cane height, stalk number, stalk diameter, and green leaves number (r = 0.41∗–0.60∗∗) at 8 and 12 MAT. This study provides new insights into the physiological and agronomic performance of a juice-type sugarcane cultivar grown in acidic sandy soils, offering valuable information for optimizing nutrient management and breeding strategies in juice sugarcane production.