石灰在酸性稻田的施用效果

在土壤呈酸性且重金属铜、镉含量相对较高的稻田开展施用石灰效果试验。试验显示,施用石灰可提升土壤pH值,平均750 kg/hm~2石灰提升土壤pH值0.179;施用石灰可促进土壤有机质分解,增加土壤氮和磷的有效性,也会影响土壤铜、镉全量变化。试验初步表明,处理C(石灰用量750 kg/hm~2)的稻米对铜、镉富集能力较强。增施石灰可减少土壤铜、镉向稻米转移富集。水稻对镉的富集能力高于对铜的富集能力。试验表明,施用石灰可增加水稻有效穗数和千粒重,增产效果显著。以石灰用量750 kg/hm~2的水稻产量最高,效益最好,比CK增产干谷619.7 kg/hm~2,每千克石灰增产稻谷0.83 kg,净收入1 068.7元/hm~2,产投比为2.66。科学施用石灰可促进水稻增产和减轻稻米对铜、镉富集。

The effects of lime application on soil properties and rice yield in acid paddy fields

The experiment about effects of lime application on soil properties and rice yield in the acid paddy soil which hadrel-atively high copper and cadmium content heavy metals was carried out. The results showed that lime application increased the soil pH value, average 750 kg/hm2 of lime increased soil pH value by 0. 179. The application of lime promoted the decomposition of soil organic matter, increased the availability of soil nitrogen and phosphorus, and also affected the total amounts of Cu and Cd in soil. The results showed that the concentration of Cu and Cd in rice treated with C (750 kg/hm2 ) was the highest. The application of lime reduced the concentration of copper and cadmium in rice. The enrichment ability of rice for copper was higher than that of copper. The results showed that the application of lime increased the number of effective panicles and 1000 grain weight. The lime dosage of 750 kg/hm2 was the best, which increased 619. 7 kg/hm2 dry valley yield compared with CK, and per kg of lime increased the rice yield, net incomeand the input-output ratio by 0. 83 kg, 1068. 7 yuan/hm2 , 2. 66, respectively. Lime application promotedrice yield and reduced the rice copper and cadmium enrichment.