【摘要】 通过对辽宁省北部风沙区农田土壤的钾素状况及固钾力的分析研究,发现该区土壤中,全钾含量为20～30g/kg,属较高水平;速效钾、缓效钾含量均处于较低水平,分别为35.6～71.4mg/kg、213.3～376.5mg/kg;固钾率为21%～66%。钾肥田间试验表明玉米施用钾肥能刺激苗期次生根的生成,提高苗期的生长量,增强抗旱、抗土壤不良环境的能力,提高籽实的千粒重、穗粒数,增产效果显著,但肥效受当年的气候影响较大。更多还原

【Abstract】 Studies revealed that the farmland soil in semi-arid area of northwestern Liaoning, had a high amount of potassium, 20~30g/kg in total,but with a low level of availability. It had 35.6~71.4 mg/kg quick-acting K, 213.3~376.5 mg/kg slow-acting K,with power of fixation 21-66%. Field results on corn showed that application of K fertilizer could promote the development of secondary roots and growth of seedlings, increase thousand-seed weight, and number of ear and seed, resulting in significant increase of output. The effectiveness was largely dependent on rainfall.更多还原