(Bloomberg) -- Canola capped the week with the longest rally in more than three years and spring wheat gained as menacing drought and scorching heat puts North American crops at risk.“It will be a hot and dry holiday weekend in the Northern Plains and northern Midwest,” Arlan Suderman, chief commodities economist at StoneX, said in a note.While some isolated rains are expected in parched areas of North America, nothing has fundamentally changed in the weather to alter the bullish mood. Wild weat