The research chose three testing factors,which were transplanting density,the amount of topdressing urea and the distributive proportions of urea as tiller fertilizer and spike\]et-developing fertilizer under their treated amounts,adopting simplex-lattice design and setting field parameter tests.

The results show that transplanting density greatly affects the establishment of a rapid growing high-yielding colony.

The field experiment was conducted by split-plot design of two factors to study the effects of applying amount of controlled-release nitrogen fertilizer(SCU) and transplanting density on the growth and development and yield of the medium super hybrid rice combination Y Liangyou 1,and the mathematical model of yield to nitrogen rates and transplanting densities was set up.

Effects of Different Sowing Date and Planting Density on Yield Formation and Quality of Two Medium Japonica Rice Varieties in Huaibei;

The largest effect of planting density was found in the first primary.

The results showed that the yield of two super rice hybrids increased with the planting density,and the increase of the number of productive panicles was the main reason for yield increase.

Effects on Japonica Rice Quality by Planting Factors(Ⅲ)——cultivated density affected rice quality;

Pass to study the effect that cultivated density on rice growth and yield, the result showed that: as cultivated density diminish, ex-period the growth measure varied small, middle-later period increased obviously, dominate tillering period and height tillering period postponed, and leaf colours varied steady on the whole growth period, rice yield increased.

The test was conducted to investigate effects of different density of female parent and method of removing fertile plants on seed yield of Qianyou 14.

Effects of rice transplanting density and early irrigation management on barnyardgrass ecological control.;

The planting density showed little impact on sapwood width,while it had highly significant effects on wetwood width.

The results indicated that the effects of planting density on crown width,crown length,DBH,wetwood areas,sapwood areas,wood basic density,compression strength parallel to grain and MOE were highly significant,and those effects on wetwood proportional,sapwood proportional and MOR were significan.

Taken Armeniaca sibirica forests in western region of Liaoning province as research objects,growth status and soil amelioration effect of Armeniaca sibirica forests under the condition of different densities were compared by the means of variance analysis and multiple comparison, and the optimum planting density of Armeniaca sibirica forests at different ages were chosen.