THE OPEN May beans: 7 1/2 lower May meal:  .10 lower May soyoil:  49 lower May corn:   1/4 higher May wheat:   6 lower Prices opened lower as called with more long liquidation in wheat and soyoil, and weaker oilshare as meal prices firmed once again.  Corn prices tried to stay the path of higher trade, but succumbed to wheat weakness.   In announcements, Argentine farmer lobby groups said they would postpone potential strike action, including suspension of grain sales to crushers and exporters, amid reports the gov. would delay announcing any new tax increases for the export of agricultural goods.  Agricultural Minister Luis Basterra met with four lobby groups, the CRA, FAA, Coninagro...