摘要
应用Hunter介绍的技术,对广东省砖红壤早地11个样本进行了土壤养分状况的网室调查,结果表明,砖红壤旱地土壤中氮、磷缺乏非常严重,减氮、减磷处理减产50％左右,钾则在花岗岩发育的土壤效果很明显,其他母质减钾处理减产30％或更少,石灰是一个重要的限制因素,pH5.0以下的土壤,其影响不亚于氟、磷、镁是一个普遍有效的元素,施镁可增产16％～40％。该类土壤不缺硫,施硫没有显著效果。微量元素要注意施用钢,11个样本中有6个效应显著,这类土壤施用硼、钼,锌效果一般,需要量多的作物可以考虑,至于铁、锰,这类土壤本身不缺乏,施用投有效果。
The nutrient status of 11 upland latosol soil samples collected in Guangdong province was surveyed by Gss method originated from Dr.A.H.Hunter.The results indicated that the selected soils were quite deficient in N and P.Treatments of no N and P addition presented the decrease of sorghum seeding dry weight by about 50%.K addition showed marked effects on sorghum in the soils developped from granite.With the soils developped from other parent material,the treatmint of no K addition decreased the sorghum seedling dry weight by about 30% or less.On the soils with pH values lower than 5.0,lime was also an important limiting factor and had similar performance to N and P application on crops.As for Mg,it was generally an effective element,and able to increase the sorghum seedling dry weight by 16%~40%.S was not deficient in the selected soils,no significant effects of S addition were obtained.With regard to micronutrients,Cu should be taken into consideration.Significant effect of Cu addition was presented in 6 among 11 soil samples.No distinct effects of B,Moor Zn addition wo showed.As for Fe and Mn,the application of theirs did not show marked effects because they were sufficient in these soils.
出处
《华南农业大学学报》
CAS
CSCD
1992年第2期74-80,共7页
Journal of South China Agricultural University
基金
与钾磷学社(PPI)合作项目
