This is a passage from "The Mowing of a Field" by Hilaire Belloc. In the essay, he describes in detail the right way to make hay.
Many think that hay is best made when the grass is thickest; and so they delay until it is rank and in flower, and has already heavily pulled the ground. And there is another false reason for delay, which is wet weather. For very few will understand (though it comes year after year) that we have rain always in South England between the sickle and the scythe, or say just after the weeks of east wind are over.
1) has ... pulled the ground
Does this mean that the grass roots are deep in the soil strongly grasping?
2) between the sickle and the scythe
My best guess is that each of them symbolizes a time when certain crops should be harvested. In the essay, a scythe is used to cut the grass to make hay. So I assume the scythe may mean the appropriate time for grass to be cut, but I'm not sure.