冷凉灌区马铃薯施肥量与种植密度对马铃薯生长及产量的影响

为了明确不同施肥量(复合肥)和种植密度对冷凉灌区马铃薯生长的影响。试验以‘冀张薯12号’为供试品种，开展施肥量与种植密度二因素试验，设3个施肥量(600、1100、1600 kg/hm²)与4个种植密度(5.25万、6万、6.75万、7.5万株/hm²)，研究不同施肥量与种植密度对马铃薯生长、产量与水分利用效率的影响。结果表明：增加施肥量能延缓马铃薯生育期，提高种植密度能缩短生育期；随施肥量增大，马铃薯株高、茎粗、叶面积指数及叶片SPAD值均显著增大；随种植密度增加，马铃薯株高、茎粗、叶面积指数及叶片SPAD值与产量均表现为先增后减趋势，施肥量与种植密度对马铃薯株高、SPAD值与产量的影响顺序为施肥量>密度；随施肥量和群体种植密度的增加，马铃薯大薯产量、大薯数、产量、水分利用效率均呈先增后减的变化趋势，产量要素之间呈极显著正相关关系，其中，以处理F₂D₃的马铃薯产量与水分利用效率最大。通过二元二次回归分析表明，当施肥量达到1065.366 kg/hm²，种植密度达到6.7...

Effects of Planting Density and Fertilization Amount on Growth and Yield of Potato (Solanum tuberosum L.) in Cool Irrigation Area

In order to clarify the effects of different fertilization rates (compound fertilizer) and planting densities on potato growth in cold irrigation area, the growth, water use efficiency (WUE) and yield of potato cultivar ‘Jizhangshu 12’ were studied by randomized block experiment. The study set up different densities (52500 plants/hm², 60000 plants/hm², 67500 plants/hm² and 75000 plants/hm²) and different fertilizer application rates (600 kg/hm², 1100 kg/hm² and 1600 kg/hm²). The results showed that the growth period of potato was prolonged by increasing fertilizer application rate and shortened by increasing of planting density. The plant height, stem, diameter, leaf area index, and leaf SPAD value of potato were increased by increasing fertilizer application rate. With the increase of planting density, the plant height, stem diameter, leaf area index, leaf SPAD value and yield of potato all increased first and then decreased. The effect order of fertilization amount and planting density on plant height, leaf SPAD value and yield of potato was fertilization amount>planting density. With the increase of the planting density and fertilization rate, the large-sized tuber yield, large-sized tuber number, yield, and WUE of potato also showed a first increase and then decrease trend, the yield of potato was significantly and positively correlated with large-sized tuber yield, large-sized tuber number and WUE. The highest potato yield and WUE were found under the F₂D₃ treatment. Regression analysis revealed that the highest yield of 50255.98 kg/hm² could be obtained under the combination of 1065.366 kg/hm² fertilization rate and 67460.00 plants/hm² planting density. The highest WUE of 110.456 kg/(hm²·mm) could be obtained under the combination of 1044.312 kg/hm² fertilization rate and 65820.00 plants/hm² planting density. The appropriate fertilization amount and planting density could increase the yield and WUE of potato, fertilization rate of 1044.312-1065.366 kg/hm² and planting density of 65820-67460 plants/hm² could achieve the synergistic increase of yield and water use efficiency. The model can be recommended as the high-yield and high-efficiency one for potato planting in cold and cool areas.