The Effect Of Climate Factors And Boron On Growth And Development And On Frunt Of Spring Wheat

Boron (B) is an essential micronutrient for the normal growth of plants. With the development of modern agriculture, the popularization of new cultivars, the improvement of cultivation measures, as well as with the increase of the cropping index, crop yield is increasing. More and more boron has been taken away from soils by the crops, which often results in the occurrence of B deficiency in some plants. The availability of B is affected by climate factors. Therefore, in order to conduct the agricultural production, it is urgent to study the effect of the climate on the availability of B.The experiments were carried out to study the integrated effect of illumination, temperature and soil water on the validity of Boron. This experiments were performed with potted planting and liquid planting, used spring wheat "NE124 (customary NE7742)" which was sensitive to B, and controlled environment chamber, rainproof shed and adumbral net conditions. By studying the validity of B, confirm the relation of the validity of B and weather condition, supply the academic gist for using B rationally and the high yield of wheat in Heilongjiang Province.The study showed:1 The amount of B had no marked effect on the height of spring wheat in the definite area. Decreasing of the intensity of illumination had no remarkable effect on the height of spring wheat under the same B supplying. The height of spring wheat was increasing slightly with adding 2.5 ℃, decreasing slightly with lessening 2.5 ℃, but the discrepancy was not remarkable. The height of spring wheat was increasing prominently with adding soil water, and decreasing slightly with reducing water.2 The amount of B had no marked effect on dry matter of wheat under the same weather condition. The decreasing of the intensity of illumination reduced the accumulation of dry matter of wheat under the same level of B supplying. Dry matter of wheat in the higher or lower temperature treatments were all lower than controls in temperature treatment, but not remarkable in potted treatment. In water treatment, the weight of dry matter was up or downbecause of increasing or decreasing water supplying.3 The accumulations of B in higher B treatments were all higher than lower B treatments under the same weather condition, and reduced in the feeble illumination treatment under the same level of B supplying. The accumulations of B of wheat under higher or lower temperature treatments were all lower than controls, but not remarkable in potted treatment. In water treatment, the order of the accumulation of B is: waterlogged treatment > CK > droughty treatment, but the discrepancy was not remarkable.4 The fruited rate of spring wheat was higher in high B supplying under the same weather condition, serious lack of B leaded to no fruit of spring wheat. Increasing the supply of B was propitious to enhancing the fruited rate. The fruited rate of spring wheat in the feeble illumination treatment was low under the same level of B supplying, and in the higher or lower temperature treatments reduced without exception. In water treatment, the fruited rates of spring wheat in waterlogged and droughty treatment were all lower than CK.5 The yield of spring wheat was high in higher B supplying under the same weather condition, serious lack of B leaded to no yield of spring wheat. The feeble illumination treatment leaded to none of yield of spring wheat under the same level of B supplying. The yield of spring wheat in the higher or lower temperature treatments reduced without exception. In water treatment, the order of the yield of spring wheat is: waterlogged treatment > CK > droughty treatment.6 Sufficient Boron supply could strengthen the resistance of wheat against stress of environment, but under the stress of environment, the unfavorable influence of absence of Boron on wheat would be enhanced.