摘要
运用^(15)N和^(14)C示踪技术,研究了雹灾后施氮配合中耕对棉株吸氮动态、吸氮量、^(14)C同化物生产及运转分配的影响。研究结果表明,蕾期遭受雹灾后及时施氮并配合中耕,可使棉株开始吸收肥料氮的时间提前,棉株吸氮量、含氮量和肥料利用率也显著提高。棉株花铃期的相对光合作用强度(以放射性比强表示)利^(14)CO_2同化量均显著高于单纯施氮处理和对照。而且,棉株的同化产物以较大的比例转运至生殖器官特别是成铃中,并最终转运到籽棉。反映到产量和产量构成因素上,表现为单位面积棉铃数、皮棉产量和霜前花率的明显提高。
Using 15N and 14C tracing technique, the effect of N application combined with
hoeing on the uptake of N, production and partitioning of 14C assimilates within cotton plant af
ter hailing damage occuring at squaring stage were investigated. It was showed that cotton plant
began to absorb N from fertilizer after hailing damage eariler than no hoeing treatment, in re
sponse to N application+hoeing and the total amount of N absorbed, N concentration and fertil
izer utilization efficiency of cotton plant were increased significantly. As a result, the 14CO2 as
similation of cotton plant at flowering and fruiting stage was markedly higher than control and no
hoeing treatment. Moreover, the partitioning of 14C assimilates into bolls and seed cotton were
increased greatly, resulting in significant increase of boll number per hectar, lint yield and pre-
frost lint.
出处
《作物学报》
CAS
CSCD
北大核心
1998年第3期380-384,共5页
Acta Agronomica Sinica
关键词
棉花
雹灾
同化物
皮棉产量
氮肥
Cotton (Gossypium hirsutum L. )
Hailing damage
14C assimilates
Lint yield
