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调整播种期和收获期可以防止马铃薯种薯退化。具体方法是;在高寒区春播早收;在比高寒区稍低暖的一季作地区秋播留种;在二季作地区春茬早种早收,秋茬晚种晚收。但都因生育期缩短,产量很低。1974年我们在蔚县西合营公社南场大队对留种马铃薯进行掐尖打顶试验,提早在4月上中旬播种,在6月初部分植株现蕾尚无开花株时掐尖打顶,试验的四个品种掐了尖的普遍比不掐尖的植株稍矮,叶色较浓;7月初阉取比
Adjusting the sowing and harvesting stages can prevent the potato from degradation. Specific methods are; early spring in the alpine area sowing; alpine area slightly warmer than the season for the autumn sowing; in the second quarter as early spring crop early harvest, autumn crop late harvest late. However, due to shortened growth period, the yield is very low. In 1974 we Yuxian West Camp, South Field Brigade stubble potato spikes topping test early in mid-April sowing, in early June when some plants buds without flowering pinch tip topping, the experimental Four species pinch the tip is generally less than the tip of the plant slightly shorter, thicker leaf color; castration ratio in early July