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１９９２－１９９３年的试验结果表明，苏丹草新品种新苏２号种子生产的适宜密度，原则上要使保苗株的主穗全部生长发育为穗大粒多、能全部成熟，而且还要使部分植株的部分分蘖或分枝的穗成熟。在土壤肥力中等的条件下，，播种量以１５－１８ｋｇ／ｈｍ２为宜，肥地宜偏密，瘦地宜偏稀，保苗数以６７．５×１０４－７５．０×１０４株／ｈｍ２为好。
The results of 1992-1993 showed that suitable density of seed production of new Sudan grass variety Xinsu No.2 should in principle make all the main spikelets of seedlings grow and develop into large spikelets and can be fully matured, Partially tiller or branched spikelets mature. In medium soil fertility conditions, sowing rate of 15-18kg / hm2 is appropriate, fertile land should be more dense, thinner should be thinner, seedling number to 67.5 × 104-75.0 × 104 plants / hm2 it is good.