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用P~(32)示踪法研究结果表明,甜菜在1～2片真叶期已开始吸收磷肥。至叶丛繁茂期,单株绝对吸磷量和对磷肥利用率均明显增高,但单株相对含磷量却明显降低;磷肥施到距种子2、4cm以下可显著提高甜菜对磷肥的利用率。至7月中旬利用率分别达4％和7.9％,比种、肥混施分别提高60％和2倍;磷酸二铵做种肥,其分解产生的NH_4对甜菜有毒害作用,可降低出苗率、保苗率,也影响对磷肥的吸收利用。采用种、肥分层施可缓解和避免NH_4~+对甜菜的伤害。
The result of P ~ (32) tracing showed that the sugar beet had started to absorb phosphate fertilizer in 1 ~ 2 true leaf stage. However, the relative phosphorus uptake per plant and the utilization rate of P fertilizer were significantly increased, but the relative P content of the single plant significantly decreased. Phosphorus fertilizer application up to 2,4 cm from the seed could significantly improve the utilization of phosphate fertilizer by sugar beet . By mid-July, the utilization rate reached 4% and 7.9% respectively, which was 60% and 2 times higher than that of the mixed seed and fertilizer respectively. As a kind of fertilizer, diammonium phosphate could decompose the NH_4, which could poison the beet and reduce the germination rate , Seedling rate, but also affect the absorption and utilization of phosphate fertilizer. The use of species, fertilizer stratification Shi can alleviate and avoid the damage of sugar beet NH_4 ~ +.