Sorghum is a versatile, drought-resistant cereal crop. Increasing sorghum production needs special attention, although Indonesia has the potential for sorghum development. Irradiated chitosan can be used as a plant growth promoter and organic fertilizer to improve the performance of sorghum. This study aims to provide recommendations for sorghum varieties that are suitable for development and planting in dry land and are known to be able to control pests organically with the application of chitosan irradiation with optimum concentration. The experimental design was a separate plot with sorghum varieties (Numbu, Keller, and Kawali) as the main plot and the irradiated concentrations of chitosan (without irradiation, 2, 4, and 6 ml.L<sup>-1</sup>) as subplots. The results showed that the sorghum variety and the optimum chitosan irradiation concentration of 2.76 and 5.15 ml.L<sup>-1</sup> increased the dry weight of stover per plant by 93.04 g per plant and increased the sugar content of sorghum with Brix 15.03%. The varieties of Numbu, Keller, and Kawali significantly affected plant height, number of leaves, weight of 100 seeds, and plant fresh weight per plot or forage of sorghum.
Sorghum bicolor is a C4 crop and cereal that is drought tolerant. Sorghum cultivation has several advantages because it requires very little agricultural input. Sukoharjo Regency has dry land and grumusol soil types located in areas with limited water sources, with physical properties of the soil being hard when dry. The experiment is randomized block design with 2 treatment factors. The first treatment was varieties of sorghum (V1=Numbu, V2=Super 1, V3=Suri 3, V4=Keller, V5+Kawali, V6=Black Sorghum, and V7=Bioguma 2). The second treatment was a type of plant growth promoter (no treatment, Auxin 10 ml.L-1 and Gibberellins 10 ml.L-1) and was repeated 3 times. The observation variables as plant height 6 weeks after planting, number of leaves 6 weeks after planting, stem diameter 4 weeks after planting, and seed weight per plans. The result showed the interaction between varieties and applications of plant growth promoter on the number of leave. Bioguma 2 and Super 1 variety had a significant effect on plant height and seed weight per plant.
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