1. Experiment in greenhouse by growing seedling in pots demonstrated (1)the growth of ash seedlings were sensitive to fertilizer supply rate, the total biomass of ash seedlings increased significantly with higher supply rate (true for both balanced and P only slow release fertilizer treatments);
Because the loss of fertilizer was reduced, the level of fertilizer supply could be sharply dropped. The organic fertilizer (52.5 kg/hm\+2) still increased yield by 9.9 %(1996)～14.38%(1997), and yield value by 1? 740.6 yuan per hectare(1996)～3?
The study showed when considering soil and crop at the same time, there exists balanced nutrient type or unbalance nutrient type for fertilizer supply during seedling period of crops as well as specific application ratio.
The capacity of soil fertility supply and soil fertility degree were researched. Nutrient content of vegetable plot was analysed in Sierozem; and also,nitrogen and potassium effected on cucumber yield were studied.
4)The succesive cropping with wheat could bring about a reduction of grain yield of wheat because the capacity of supplying fertilizer was influenced by a decrease in the number of microorganism in soil.
The result showed the notable effect of climate on soil supplying nutrient capability and that was K_2O>N>P_2O_5 in high temperature and less rain years,P_2O_5>K_2O>N in low temperature and more rain years,and K_2O>P_2O_5>N in normal years.
The suitable ratio of basal∶elongation∶booting N fertilizer application was 2∶1 ∶1 with 240 kg(N)·hm~(-2)() in soil with medium fertility, but the suitable ratio of basal∶tillering∶elongation∶booting N fertilizer application was 10∶2∶1~2∶6~7 with (150 kg(N)·hm~(-2))() in soil with high fertility.
The daily nutrients supplying rate of NO~-_3-N,H_2PO~-_4 in soil might be characterized by parameter b in the Elovich,and that of NH~+_4-N,K~+ might be characterized by parameter b in parabola diffusion equations.
Organization of the paper scheme-based wholesale fertilizer supply was suggested as one of the effective means of supporting the agricultural branch which is in prolonged depression.
Depending upon fertilizer supply, ecosystem net CO2 uptake per ground area in full sunlight (NCEmax) was 41-81% higher in open-top chambers supplied with doubled ambient partial pressure (pa) of CO2 than in plots receiving ambient CO2.
Two naturalized dandelions,Taraxacum officinale andTaraxacum laevigatum, were grown in mixed stands at various plant densities and mixing ratios with various levels of fertilizer supply until seeds were produced.
The present paper deals with the influence of the intensity and its persistence of nitrogen supply to the formation and development of the organs of rice plant and also with the resulting physiological feature of these influences. Pot culture experiments with paddy soils were conducted in open field. Organic manure and ammonium sulphate were applied at different stages of growth, i.e. tillering, internode elongating and panicle differentiating stage. The results are summarized as follows:1. Experiments reve...
Ammonium bicarbonate, still being one of the main nitrogen fertilizers at present time in China, is easily volatilizable in soils. Various field experiments as well as practices have repeatedly shown that, if prilled and applied beneath the soil surface about 6 cm, its effect on the growth of crops will be markedly increased. In order to get some idea about the mechanism involved in its beneficial effect, the present study was undertakers. Experiments were carried out in pots under greenhouse conditions as ...
improving the field condition is an important factor for the increase of rice yield.High yield paddy field should possess the following characteristics, thick and fertile soil horizon,desirable soil structure, good drainage and irrigation facilities, low ground-water level and abundant soil organic matter,
供肥
fertilizer supply
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