不同pH低磷土壤上的水稻生物学性状

通过盆栽试验，研究了6个水稻材料（4个耐低磷水稻99011、580、508、99112和2个磷敏感水稻99012、99056）在3种不同pH低磷土壤上的生物学性状．结果表明：580、508和99112的生物学性状在3种土壤上均无明显差异，表现出耐低磷特性；99011在石灰性土壤上的耐低磷能力低于中性和酸性土壤，其相对经济产量比酸性和中性土壤分别降低11．9％和10．4％；99012在石灰性土壤上的耐低磷能力相对较强，其相对经济产量比酸性和中性土壤分别提高19．6％和22．2％；99056在酸性土壤上的耐低磷能力相对较强，其相对经济产量比石灰性和中性土壤分别提高25．0％和19．6％．磷营养水平及土壤类型对水稻产量的影响主要体现在对有效穗的影响上．此外，99011、580、508和99112在3种土壤上的剑叶磷浓度及其相对值均显著高于99012和99056．这也是前四者具有较强耐低磷能力的原因之一．

Biological characters of rice on P-deficient soils with different pH value

With pot culture, this paper studied the biological characters of four low-P tolerant rice genotypes 99011,580,508 and 99112 and two low-P sensitive rice genotypes 99012 and 99056 on three P-deficient soils with different pH. The results indicated that on test soils, 580, 508 and 99112 had similar low-P tolerant ability. 99011 had poor low-P tolerant ability on alkaline soil, with its relative grain yield being 11.9% and 10. 4% less than that on acid and neutral soil, respectively. 99012 showed a relatively stronger low-P tolerant ability on alkaline soil, and its relative grain yield was 19.6% higher than that on acid soil and 22. 2% higher than that on neutral soil. 99056 showed a stronger low-P tolerant ability on acid soil, and its relative grain yield was 25.0% and 19.6% higher than that on alkaline and neutral soil, respectively. The effects of soil P level and soil type on rice grain yield mainly manifestied on the number of available spike. The P concentration and its relative value in flag leaves of 99011, 580, 508 and 99112 were significantly higher than those of 99012 and 99056, which might be another factor resulting in the stronger low-P tolerant ability of 99011,580, 508 and 99112 than 99012 and 99056.