LUNGELO NDHLOVU FOR 18 years, Thokozile Ncube has been planting her crops in manure-filled holes covered with straw - and every year, she grows enough to feed her family, as other farmers in Zimbabwe's drought-prone Matobo district watch their crops shrivel. The traditional planting method helps crops survive droughts by keeping them hydrated for longer than tilling and watering an entire field, said the mother of eight from Gwangazile village, 40 km (25 miles) south of Bulawayo. "Whenever the rain comes, that's when you do the planting and your crops will remain green, even during a dry spell, until the…