以5年生红枣园为研究对象,在氮磷钾施肥量一定条件下,研究不同时期氮磷钾肥的分配量对枣园土壤肥力及红枣树生长、产量的影响。结果表明,氮肥分配试验中,萌芽期施氮肥270 kg hm-2的土壤有机质、碱解氮、速效磷、速效钾增幅最大,较花期...以5年生红枣园为研究对象,在氮磷钾施肥量一定条件下,研究不同时期氮磷钾肥的分配量对枣园土壤肥力及红枣树生长、产量的影响。结果表明,氮肥分配试验中,萌芽期施氮肥270 kg hm-2的土壤有机质、碱解氮、速效磷、速效钾增幅最大,较花期、果实膨大期重施氮肥,碱解氮含量提高了15%和16%,枣树生长指标的综合效果最优、单株产量最高。磷肥分配试验中,果实膨大期施磷肥405 kg hm-2的土壤肥力效果最优、枣树树高、冠幅面积、茎粗、枣头长、枣头粗的增加量较缺磷处理分别提高12%、66%、19%、3%、168%,单株产量最高。钾肥分配试验中,萌芽期和果实膨大期施钾肥67.5 kg hm-2的土壤肥力最高、枣树生长指标的综合效果最优,其单株产量为1.46 kg plant-1,折合产量可达14650 kg hm-2,显著高于果实膨大期重施钾肥处理,较缺钾处理提高23%。萌芽期施纯N、P2O5、K2O肥270、135、67.5 kg hm-2,花期施纯N肥202.5 kg hm-2,果实膨大期施纯N、P2O5、K2O肥202.5、405、67.5 kg hm-2,对提高土壤肥力和产量,促进枣树生长发育效果最佳。展开更多
Feeding experiments using three strains ofentomopathogenic fungi, Beauveria bassiana, Metarhizium anisopliae and Isaria fumosorosea were conducted with newly moulted 3rd-5th instar Ocinara varians Walker larvae in the...Feeding experiments using three strains ofentomopathogenic fungi, Beauveria bassiana, Metarhizium anisopliae and Isaria fumosorosea were conducted with newly moulted 3rd-5th instar Ocinara varians Walker larvae in the laboratory. The mortality of larvae immersed individually in spore suspension （1 × 10^7 spores/mL） of all the strains was 〉 80% except 5th instar larvae treated with M. anisopliae which transformed into pupae, but did not result in adult emergence. The growth （total body mass）, consumption, relative consumption rate and relative growth rate, were reduced at all three larval stages, while developmental time was extended in infected larvae with concurrent significant increase in approximate digestibility in infected larvae. Conversion of digested food （ECD） and ingested food （ECI） values declined in infected larvae as compared to the healthy larvae （control）. The 5th instar larvae treated with M. anisopliae showed higher ECD and ECI values than control. Based on mortality and growth inhibition it can be suggested that all the studied fungal strains have a high potential for biocontrol and could be developed into biocontrol agents against O. varians.展开更多
文摘以5年生红枣园为研究对象,在氮磷钾施肥量一定条件下,研究不同时期氮磷钾肥的分配量对枣园土壤肥力及红枣树生长、产量的影响。结果表明,氮肥分配试验中,萌芽期施氮肥270 kg hm-2的土壤有机质、碱解氮、速效磷、速效钾增幅最大,较花期、果实膨大期重施氮肥,碱解氮含量提高了15%和16%,枣树生长指标的综合效果最优、单株产量最高。磷肥分配试验中,果实膨大期施磷肥405 kg hm-2的土壤肥力效果最优、枣树树高、冠幅面积、茎粗、枣头长、枣头粗的增加量较缺磷处理分别提高12%、66%、19%、3%、168%,单株产量最高。钾肥分配试验中,萌芽期和果实膨大期施钾肥67.5 kg hm-2的土壤肥力最高、枣树生长指标的综合效果最优,其单株产量为1.46 kg plant-1,折合产量可达14650 kg hm-2,显著高于果实膨大期重施钾肥处理,较缺钾处理提高23%。萌芽期施纯N、P2O5、K2O肥270、135、67.5 kg hm-2,花期施纯N肥202.5 kg hm-2,果实膨大期施纯N、P2O5、K2O肥202.5、405、67.5 kg hm-2,对提高土壤肥力和产量,促进枣树生长发育效果最佳。
文摘Feeding experiments using three strains ofentomopathogenic fungi, Beauveria bassiana, Metarhizium anisopliae and Isaria fumosorosea were conducted with newly moulted 3rd-5th instar Ocinara varians Walker larvae in the laboratory. The mortality of larvae immersed individually in spore suspension （1 × 10^7 spores/mL） of all the strains was 〉 80% except 5th instar larvae treated with M. anisopliae which transformed into pupae, but did not result in adult emergence. The growth （total body mass）, consumption, relative consumption rate and relative growth rate, were reduced at all three larval stages, while developmental time was extended in infected larvae with concurrent significant increase in approximate digestibility in infected larvae. Conversion of digested food （ECD） and ingested food （ECI） values declined in infected larvae as compared to the healthy larvae （control）. The 5th instar larvae treated with M. anisopliae showed higher ECD and ECI values than control. Based on mortality and growth inhibition it can be suggested that all the studied fungal strains have a high potential for biocontrol and could be developed into biocontrol agents against O. varians.
