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在浙江金华由红色粘土发育的酸性水稻土上,对稻—稻—大麦连续,次施石灰的试验结果表明,适量地施石灰可使大麦增产2—3倍,而水稻的反应一般不明显。对土壤和作物的测定显示,大麦增产的原因主要与石灰提高土壤pH,消除铝的毒害,提高磷肥有效性,促进根系发育,并显著增强大麦对磷、钾等养分吸收有关。但施石灰反而降低了水稻对磷素的吸收。因此,石灰一般宜用于大麦等旱作物。从产量、经济效益、消除铝毒及养分有效性诸因素综合考虑,对大麦的石灰用量以中和土壤pH至6.0左右为宜。但不论何种作物,连续大量地施石灰都是极不可取的。
In acidic paddy soil developed by red clay in Jinhua, Zhejiang Province, the results of continuous and sub-lime tests on paddy-rice-barley showed that suitable amount of lime could increase the yield of barley by 2-3 times and the response of rice was not obvious. Soil and crop measurements showed that the main reasons for barley yield increase with lime to increase soil pH, eliminate aluminum toxicity, improve the effectiveness of phosphate fertilizer, promote root development, and significantly enhance barley nutrient absorption of phosphorus and potassium. However, lime but reduced the absorption of phosphorus on rice. Therefore, lime is generally suitable for dry crops such as barley. Considering the factors such as yield, economic benefits, elimination of aluminum toxicity and nutrient availability, it is advisable to neutralize the pH of the soil to about 6.0 for the lime content of barley. However, no matter what crop, a large number of continuous application of lime are extremely undesirable.