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请教一个冠词用法的问题

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请教一个冠词用法的问题
课文原文:When the fire had at last been put out,the forest authorities ordered several tons of a special type of grass-seed which would grow quickly.The seed was sprayed over the ground in huge quantities by planes.The planes had been planting seed for nearly a month.其中,seed几次出现,最后一句里的seed明显为之前出现的seed,应该可以加the,但文中却没用定冠词,不知应怎样理解?
planting seed
指播种行为,并非指具体的种子