Table of Content

10 September 1991, Volume 12 Issue 03

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STUDY ON THE CHARACTER OF PADDY FIELD MICROCLIMATE WITH VARIOUS PLANT TYPE OF RICE CULTIVARS BY APPLICATION OF DATA LOGGER SYSTEM

Zhang Xu Lin Daoxun He Ziru Chen Zhaoming Kong Qingni Yu Zhaoying Qi Runheng Liang Zuyang Liu Yanzhuo (Rice research institute Guangdong academy of agricultural sciences) Osmond,C.B. Wong,S.C. Terashima,I.(Australian national university Canberra,Australia)

1991, 12(03):  40548-405. 

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Data of microclimate of the paddy field recorded by a micrometeorologi- cal data logger system was analyzed intensively and the microclimatic chara- cters during late rice grain filling period was discussed in detail.Data showed that the quanta value in erect-leaf cultivar was almost as much as two times comparing the one with horizontal-leaf in 15 centimeters height inside the canopy;difference of temperature recored in the surface of plant and leaf between two cultivars inside the canopy was negligible;relative humidity was also recorded at the 1.5 meter height.Experimental data indicated the better utilization of solar energy was the most important factor for contributing higher yielding potential in erect-leaf cultivars.Aside from this,reliability for using this micrometeorological data logger system was also verified.

A CLIMATIC-FACTOR-BASED MATHEMATICAL MODEL USED IN FORECASTING INCIDENCE OF WHEAT SCAB

Lu Zhaocheng Shen Caiyun (Xinyang Research Institute of Agricultural Sciences HENAN)

1991, 12(03):  40704-407. 

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Wheat scab caused by Gibberella zeae is a typical climatedependent dise- ase.The incidence degree depends largely on the weather conditions(tempera- ture,rainfall,raindays,RH,and sunhours)between late April and ear May, when wheat plants are in the heading-flowering stage.This paper presents a mathematical model used in forecasting the incidence of this disease.The multifactor comprehensive correlation method is used to establish a foreca- sting equation which was found to have a goodness of fit of 95.6%.