广东冬种马铃薯测土配方施肥试验初报

为摸清水田条件下，氮、磷、钾不同配比施肥对广东冬种马铃薯的生物学性状的影响．设计了冬种马铃薯测土配方施肥试验。结果表明：试验各处理对马铃薯经济性状有一定影响，如株高、单株结薯块数、薯块干物质含量等；但对产量影响最大，其中，N2P2K1处理马铃薯的产量最高，为28485kg／hm2．比N0P0K0处理增产18030kg／hm2，增产率为172．5％。同时，初步建立了广州市马铃薯产量（Y）与N、P、K三种肥料之间的回归方程，并初步得出马铃薯最佳施肥量为：氮肥（N）290kg／hm2，磷肥（P2O5）153kg／hm2，钾肥（K2O）298kg／hm2，最佳施肥量比例为1：0．5：1．03．

Preliminary Report on Formula Fertilization according to Soil Testing in Winter Potato in Guangdong

The effect on potato biological characteristics of different fertilization formulas, which in Guangdong province rice field were studied for understanding the effect of soil testing and fertilizer recommendation in winter planting potato. The results showed that there were a little effect on the biological characteristics of potato, for example, plant height, number of tubers per plant, dry matter content, and so on. But there was obvious effect on the yield, and the yield of N2P2K1 was 28 485 kg/hm2 which yield increased by 18 030 kg/hm2 than N0P0K0, the yield increase rate was 172.5%. The regression equation of a nitrogen （N）, phosphorus （P） and potassium （K） fertilizer with the potato output （Y） was preliminary established, and the best fertilization rate in winter potato was N 290 kg/hm2, P205 253 kg/hm2, and K20 298 kg/hm2, which the best fertilizer ratio was 1 ： 0.5 ： 1.03.