Due to the limitation of field condition,single scan line method has been applied to estimate randomly distributed joint trace length on occasion,namely,sampling bias correction of random joint trace length.
Finally,it compares this method with RMR method,Q method and Tunnel Standard Graduation method,which were inapplicable with the field condition,and declares the applicability of this method in this stratum. Additionally,it analyzes the limitation of the traditional methods in this geological condition.
The optimum environmental factors of producing β-carotene condition of two ? phase culture of Dunaliella Salina is studied by the experiment of the othogonal design [L27 (313)] for simulating the field condition.
The P-V Curve water Parameters(WPs)of 12 trees are measured in field condition during tree growth season in 1996. The pattern of Wps' seasonal changes and trees' drought resistance and relationship between them are studied .
The result showed that the absorption amounts of N, P and K were in the order of K>N>P under field condition. For one-year-old B. chinesnse DC. , the average N, P_2O_5 and K_2O absorption per 100kg dry matter of root were 11.77kg, 2.43kg, 14.07 kg respectively;
The 3 different slow release fertilizers(SRF1,SRF2 and SRF3)are investigated from the 3 indexes such as the winter wheat yield,nitrogen content in plant during various stages and nitrogen fertilizer use efficiency,compared with the 3 treatments of nitrogen fertilizer-free applied treatment(CK1),urea applied before sowing(CK2) and treatment of urea with basal N∶top dressing N 1∶1(CK3) under field condition.
Under the field condition,maize yield,total uptake,net uptake,physiological rate and agronomic use efficiency of nitrogen were the same as CK or increased. The apparent utilization rate of nitrogen was enhanced by 14.8%～15.2% treated with urea reduced by 5%～15%(7.8～23.7kg/hm~2) and added with compound nitrogen fertilizer synergists.
Under field condition, five winter cultivars, Lingkang 502, CA16, 4P3, Chaoyou 66 and Jing 411, were used to determine the diurnal dynamics of total dissolved solids in flag leaf in order to give some theoretic base to the growers and breeders.
When the temperature increased by 10"C, the rate of nitrogen release from rice controlled fertilizer was increased by 1.8 ?2.0 times. In field condition on taking the days after fertilizer application and cumulative soil temperature as the variable, CNR can be described by the formulas CNR=a+bD+cD2 and CNR=a+b (CST)+c (CST) 2 , respectively.
The effects of enhanced UVB radiation (3.18 kJ·m-2·d-1, approximately 21.6% ozone depletion in Xi' an, Alt.550m, 34°N) on morphology, physiology and allometry of Amaranthus retroflexus were studied under field condition.
Under field condition, the maximum sulphur percentage of above-ground parts of winter wheat was at booting, which is 0. 406% with fertilizing sulphur treatment and 0. 364 % with no-fertilizing sulphur treatment (CK).
and it had the tendency to increase the content of chlorophyll in the leaves and the rate of photosynthesis. Under the field condition, titanium citrate could increase soybean yield 3. 9 %～ 8. 6% by seed dressing and 4. 6 % ～16.5 % by foliage spraying.
Electromagnetic signals in very low frequency range (VLF, below 10kHz) can penetrate rock sufficiently in order to locate a miner with nearly no disturbance of the field structure, if the near field condition is fulfilled.
The region of quantum oscillations is bounded (in the magnetic field) from below by the weak field condition (ωcτt≤1) and from above by the quantum limit condition (ξF≥?ωc/2).
The dormancy of buried seeds was almost broken under the field condition in January.
However, somatic embryos had better germination when cultured under the suppressed geomagnetic field condition.
Solar wind particles move radially away from the Sun, satisfying the frozen-magnetic field condition.