Chinese Journal of Agrometeorology

Potential Precipitation Productivity and Its Appropriate Exploitation Measures in Dry farming Areas of Northern China

Leng Shilin (Institute of Agrometeorology, Chinese Academy of Agricultural Sciences, Beijing 100081)

1997, 18(06): .

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Five year field fixed location experiments and macro investigations carried out in dry farming areas, semiarid liable to drought, semiarid, subhumid areas liable to drought, in northern China showed a high possible exploitation degree of potential precipitation productivity. Based on the current situation, lack of resources and poor environmental conditions, low level of economy and technology, difficulties existed in the exploitation of potential precipitation productivity, appropriate measures (by steps and by lays) for exploiting potential precipitation productivity were pointed out in this paper.

Studies on Nutrient Concentration in Diets for Laying hens at Different Seasons Ⅱ. Study on Optimization of Diets for Loman Laying hens at High Temperature

Zhou Ming Li Peiying (Animal Science & Agriculture College, Auhui Agricultural University, Hefei 230036) Peng Kesen Ding Changchun (Shushan Poultry Farm, Hefei)

1997, 18(06): .

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During the high temperature in summer season(July l,1993 ￣ Sept.30, 1993, Hefei,air temperature of open side poultry house: 27.9￣38.7℃, mean: 32.3℃), 6 groups of Loman laying hens (23￣36 weeks old ) in same ecological environment were fed with 6 diets of various formulas. The diet I was made according to the feed standard recommended by Loman company. Some proper adjustments for nutrient concentrations were made in diets Ⅱ～Ⅵ. Feeding results showed that there were significant (p<0.05) or great significant (p<0.01) differences between various groups of hens in laying rate, feed conversion efficiency and feed cost. Laying rate (83.93%) and feed conversion efficiency (43.64%) of the fifth group hens were the highest (p<0.01), and increased by 6.36% (p<0.05) and 5.77% (p<0.05), respectively, as compared with the first group (laying rate: 78 91%; feed conversion efficiency: 41.26%). Feed cost of the fifth group (2.55 yuan/kg) decreased by 14.51% (p<0.01), as compared with the first group (2.92 yuan/kg). Formula (%)of the fifth group diet: corn 61.0, wheat bran 3.0, soybean cake 17.0, fish meal 4.0, rapeseed cake 4.3, methionine 0.14, lysine 0.05, bone meal 0.8, lime stone meal 8.5, dicalcium phosphate 0.8, common salt 0.31, trace element premix 0.12, Loman vitamin premix 0.08.

Program for Rational Layout of Rice Cropping Systems in Different Types of Climatic Years and Strategies in Fujian

Gan Weilian Li Wen Chen Lixuan Zhang Lingzhao (Meteorological Institute of Fujian Province, Fuzhou 350001)

1997, 18(06): .

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According to the social statistics data in agricultural production in Fujian and its parallel climatic data and combining the linear program models, yield forecasting model of agrometeorology was developed by using the principle of operational research. The scheme for rational layout of rice cropping systems in different types of climatic years and its targets of total yield per annum were worked out objectively. With the above results, agriculturists could be able to put forward suggestions on rice production for policy makers in agriculture.

Investigation of Effect of Ecoclimatical Factors on Thousand grain Weight of Winter Wheat

Du Jun (Xizang Meteorological Station,Lhasa 850000)

1997, 18(06): .

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The effects of meteorological factors on thousand grain weight,filling velocity and filling period in main development phase of winter wheat in Xizang, were studied by using statistical principles and analytical method. The result shows that, during the flowering stage to the yellow maturity stage of wheat, the suitable conditions for extending filling period are lower mean temperature and about 171.6 mm of the amount of precipitation. Lower mean temperature and a little diurnal change of temperature are of great advantage for increase of thousand grain weight of whear, and the factor of diurnal change of temperature is significant.

The Agricultural Meteorological Conditions for the Occurrence and Development of Spring Wheat Yellow Stripe Rust in Qinghai

Yan Jinrui Ma Lin (Qinghai Meteorological Bureau, Xining 810001)

1997, 18(06): .

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The data on the occurrence of spring wheat yellow stripe rust in 1985￣1993 in Qinghai Province and the correspondent meteorological factors at the same periods were compared and analyzed. the results showed that the origional places of spring wheat yellow stripe rust in Qinghai were Longdong and Longnan areas in Gansu Province and the winter wheat areas in Minhe, Xunhua counties in East Qinghai. the occurrence of wheat yellow stripe rust is started from the last 10 days of May in Xunhua, Minhe and other places in southeast Qinghai and then spread to the northwest and lasted about a month. The agrometeorological indexes of the occurrence of wheat yellow stripe rust in Qinghai Province are defined which have a practical significance for the forecasting and prevention of spring wheat yellow stripe rust.

Studies on Mitigation of Methane Emission from Rice Field

Li Jing Wang Mingxing Chen Dezhang (Institute of Atmospheric Physics, Chinese Academy of Science,Beijing 100029)

1997, 18(06): .

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Based on the experiments and research on the generation and emission factors of methane carried out for several years, 3 promising methods for mitigation of methane emission from rice field were found. The effectiveness and economic benefits of each method for mitigation of methane emission from rice field were analyzed by using cost benefit analysis method AHP. At present, the major methods are using biogas pit residue to substitute fresh organic fertilizers, rice cultivar selection, and water regime. Using biogas pit residue to substitute fresh organic fertilizers and using the hybrid rice insted of conventional rice cultivars are suitable to China. The first method can mitigate methane emission significantly, and it’s social and environmental benefits are better than the second one. But the economic benefit of the second one is prominent.

The Optimum Planting Models of Cotton Interplanted in Summer for High Yield and Quality

Chen Yanchun Zhang Zhiguang Wang Jianyuan Zhao Hong (Meteorological Institute of Shandong Province, Jinan 250031)

1997, 18(06): .

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Liaomian 9 and Zhongmian 16, improved summer interplanting varieties of cotton, are extra early and early varieties, respectively. Field experiments with 2 factors and 5 levels were conducted by using a quadratic orthogonal rotating design. Through analysing of the observed dada, the optimum planting models for different summer interplanting varieties of cotton were established. Then calculating climatic conditions for high yield and quality, The meterological conditions for high yield and quality of summer interplanting varieties of cotton were calculated, and the suitable interplanting time and densities were determined in different summer cotton areas of Shandong Province.

A Study on the Diagnostic Technique for Flowering Period Match of Perental Hybrid Rice

Peng Guozhao Feng Daquan (Sichuan Provincial Agrometeorological Center, Chengdu Sichuan, 610072)

1997, 18(06): .

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Based on the experimental data collected in Sichuan Province, the regularity of growth development and flowering of parental hybrid rice as well as the major factors affecting the arrangement of sowing time of parental hybrid rice were investigated. The coresponding forcasting model and the Diagnostic System for Flowering Period Match of Parental Hybrid Rice Seed Production (DSFPMPHRSP) were established on PC computer. Through the application to the actual seed production, 2～3 days improvement was obtained in the arragement accuracy rate, resulted in the increase of 150￣300kg/hm 2 seed of the first generation of parental hybrid rice.

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