摘要
对湖南省东安县杉木无性系种子园施肥试验的结果表明:3、6、8月中旬每次每株各施尿素0.4kg、过磷酸钙0.3kg、氯化钾0.2kg为球花产量最高的施肥方案;施肥对当年的种子播种品质有影响,但不大;种子园大片母树不挂果的原因是土壤和树体中锰含量过高而树体中的硼元素缺乏,对此提出对土壤施石灰和对母树针叶喷B肥的改良措施;3—8月是杉木种子园施N、P.K肥最适宜时期;确定8月是杉木种子园母树营养诊断进行针叶分析的最佳采样时期,并制定出杉木种子园母树的针叶中全N含量为0.8%、全P含量为0.12%、全K含量为0.7%是其临界值;针叶全N含量0.8—1.2%、全K含量0.7-0.9%是其最适浓度范围;中耕松土对种子园种子产量影响不明显。
This paper reports the research results of fertilization of the grated seed orchard of Chinese fir (Cunninghamia lanceolata Hook.) in Dongan, Hunan province. The results revealed that it was the best plan for fertilization to improve the production of conelets that each tree was spreaded 0.2kg ofpotassium chloride, 0.4kg of urea and 0.3kg of superphosphate in every middle 10 days of March, June and August. The seed quality by fertilization was not obviously effected. Analyses of nutrient elements in needles and soil showed the reason why the seed production was so low in the orchard was that Mn content was too high and B content was deficient. It was suggested that lime should be added to the soil and B be spraied on the foliage, and the mostsuitable period for spreading N, P, K fertilizers was from March to August in a year. The desirable period of collecting leaf samples for nurtientdiagnosis was August. It was found that the critical values of different nutrient elements in the needles were N 0.8%, P 0.2%,K 0.7% with the suitable ranges N 0.8-1.2%, K 0.7-0.9%. Ploughing and weeding could not significantly improve seed production of the orchard.
出处
《林业科学》
CAS
CSCD
北大核心
1994年第4期296-305,共10页
Scientia Silvae Sinicae
关键词
杉木
种子园
产量
营养元素
施肥
Chinese fir, Seed orchard, Yield, Nutrient element,Fertilization