She never saw the big tractor coming. First it plowed up her banana trees. Then her corn. Then her beans, sweet potatoes, cassava. Within a few, dusty minutes the one-acre plot near Xai-Xai, Mozambique, which had fed Flora Chirime and her five children for years, was consumed by a Chinese corporation building a 50,000-acre farm, a green-and-brown checkerboard of fields covering a broad stretch of the Limpopo River Delta.