地瓜掐尖是一项还没有被普及的增产措施,多次试验表明,掐尖的地瓜比不掐尖的地瓜增产二分之一到一倍。地瓜掐尖分两次进行。当瓜蔓长到八、九寸长时可轻掐一次;过几天后,从掐口下边又发出几根新蔓,当新蔓长到一寸时再逐个掐一次。但掐下的瓜蔓尖不易过长,否则前功尽弃。 Sweet potato pinch tip is not yet a universal stimulation measures, many tests show that pinch tip of sweet potato than not pinch sweet potato yield one-half to double. Sweet potato pinch point two times. When the melon grows to eight or nine inches long can pinch a light; a few days later, from pinch mouth and issued a few new vine below, when the new vine grows to inch when the pinch again. But pinch the melon vine tip is not easy too long, or give up.