What do you mean by 'have I killed

Te seed I spent or sown it where

The land is his and none of mine'

The poet uses an agrarian imagery to explore the relationship between a father and a son, and how, perhaps this bond weakens over time due to a gradual waning of mutual understanding and friendship. The father here, explores the causes which might have made him distant to his son, at one point also blaming himself, 'I' for having caused a generation rift. The father, implores, that perhaps he and his son were not at par with each other, in understanding or in trust. Thus the father laments that, the seed, which symbolises the fraternal bond, might have been weak from the start, or perhaps it was not strengthened with time, which is as much a fault of the son as of the father.

Best.