Regarding the editorial "Why Russia Can't Feed Itself," Nov. 5: Something must be said concerning proposed Western aid to the Soviet Union. Consideration must be given to the withholding of economic and humanitarian aid until farmers are legally allowed to own the land they work. Until Soviet food producers have the incentive promoted by private property rights, the problem of feeding their people will continue regardless of Western aid.If the Soviet government wishes to stave off annual famine it must be willing to forgo ideological opposition to private property. Only when this is done should Western aid be offered. Denny Belew, Florence, Ala. Letters are welcome. Only a selection can be published, subject to condensation, and none acknowledged. Please address them to "Readers Write," One Norway St., Boston, MA 02115.