不同钾肥品种和用量对甘蓝产量、品质和养分吸收利用的影响

以俄罗斯产KCl和K₂SO₄、新疆罗布泊产K₂SO₄、开封产K₂SO₄为试材，比较了不同钾肥品种和罗布泊产K₂SO₄不同用量在热带和墨玉两个甘蓝品种上的应用效果。结果表明:施用钾肥可以增加甘蓝产量、蛋白质及VC含量,降低硝酸盐含量。在钾肥用量为300 kg·hm^-2时,罗布泊产K₂SO₄的施用效果好于或接近其他钾肥品种,俄罗斯产K₂SO₄和开封产K₂SO₄施用效果最差。随着施钾量的增加，蛋白质含量变化不显著，VC含量增加，硝酸盐含量下降。施钾后热带产值提高29.9 %~33.2 %,墨玉产量提高15.8 %~20.5 %。利用回归方程求得热带的经济最佳钾肥用量为354.0 kg·hm^-2,最高产值为98 463.4元·hm^-2;墨玉经济最佳钾肥用量为333.0 kg·hm^-2,最高产值为98 201.2元·hm^-2。

Effects of Different K Source and Applying Dosage on Yield,Quality and Nutrient Absorption on Cabbage

Taking KCI and K₂SO₄ produced in Russia,Luobupu K₂SO₄ produced in Xinjiang and K₂SO₄ produced in Kaifeng as experimental materials,the experiment was carried out to study the effects of different K sources and applying dosage on cabbage varieties of‘Redai’and‘Moyu’.The results showed:potassium application could increase cabbage yield，the content of protein and VC,decrease the content of nitrate.When the amount of K application was 300 kg·hm^-2,the effects of Luobupu K₂SO₄ was better than or close to the other K sources.K₂SO₄ produced in Russia and K₂SO₄ produced in Kaifeng had the worst effect.Potassium application increased‘Redai’output value by 29.9 %-33.2 %,and that of‘Moyu’by 15.8 %-20.5 %.Utilizing return equation,it gained the best economical potassium application for‘Redai’was 354.0 kg·hm^-2,the highest output value was 98 463.4 Yuan·hm^-2;that for‘Moyu’was 333.0 kg·hm^-2 and the highest output value was 98 201.2 Yuan·hm^-2.