what explanation does the governor of the lagodo give to gulliver about the sad state of affairs ,the houses looking as if they were out of repair and there being no corn in the field even when tractors were using various methods

From the text:

The sum of his discourse was to this effect: “That about forty years ago, certain persons went up to Laputa, either upon business or diversion, and, after five months continuance, came back with a very little smattering in mathematics, but full of volatile spirits acquired in that airy region: that these persons, upon their return, began to dislike the management of every thing below, and fell into schemes of putting all arts, sciences, languages, and mechanics, upon a new foot. To this end, they procured a royal patent for erecting an academy of projectors in Lagado; and the humour prevailed so strongly among the people, that there is not a town of any consequence in the kingdom without such an academy. In these colleges the professors contrive new rules and methods of agriculture and building, and new instruments, and tools for all trades and manufactures; whereby, as they undertake, one man shall do the work of ten; a palace may be built in a week, of materials so durable as to last for ever without repairing. All the fruits of the earth shall come to maturity at whatever season we think fit to choose, and increase a hundred fold more than they do at present; with innumerable other happy proposals. The only inconvenience is, that none of these projects are yet brought to perfection; and in the mean time, the whole country lies miserably waste, the houses in ruins, and the people without food or clothes. By all which, instead of being discouraged, they are fifty times more violently bent upon prosecuting their schemes, driven equally on by hope and despair: that as for himself, being not of an enterprising spirit, he was content to go on in the old forms, to live in the houses his ancestors had built, and act as they did, in every part of life, without innovation: that some few other persons of quality and gentry had done the same, but were looked on with an eye of contempt and ill-will, as enemies to art, ignorant, and ill common-wealth’s men, preferring their own ease and sloth before the general improvement of their country.”