Planting Density On Cold Japonica Population Quality And The Influence Of The Lodging Resistance

In this paper to spike heavy type of grain farmers425rice varieties and farmers427rice varieties as experimental material, Set up12density treatment D1, D2(35cm x16.7cm)(30cm x16.7cm), D3, D4(35cm x13.3cm)(25cm x16.7cm), D5(30cm x13.3cm), D6(35cm by10cm), D7(25cm x13.3cm), D8(30cm by10cm), D9(25cm x10cm), the D10(35cm x6.7cm), D11(30cm x6.7cm), D12(25cm x6.7cm), by dealing with building density in different rice groups, the cold japonica under the condition of the groups of different rice plant type characteristics, photosynthetic physiology, growth and decline of the canopy structure, stem tillers dynamics and dry matter accumulation regularity, to explore the effect of planting density on rice lodging resistance and influence on yield formation, revealing cold japonica rice quality control factor, as the cold northern japonica rice provides the theory basis for the construction of a reasonable group, lay a foundation for high yielding cultivation of rice. This experiment mainly conclusions are as follows:1. With the increase of planting density, east and east425farmers427increased the plant height, tillering Angle decreases, and the eastern farmers425plant height in each period of high Yu Dongnong427, farmers425tiller Angle in each period of big Yu Dongnong427. Two varieties of rice canopy width and decreased with the increase of planting density, with the development of growth period, the east and east425farmers427canopy width decrease after rising first, east427high canopy width Yu Dongnong425farmers.2. Two varieties of rice with the development of growth period, single cavity stem tillers number show unimodal curve changes, the low density of D1, D2, deal with single cavity stem tillers number peak time delay, with the increase of planting density, single cavity stem tillers number decreases, farmers427reached the peak of the highest high Yu Dongnong stem tillers number425, its tillering ability is stronger.3. Heading stage farmers425under the main stem of function area in the D9density processing is the largest, farmers427function of the main stem of foliage area in D3density is the largest. Along with the advancement of growth period, the chlorophyll content of two varieties of rice are single-peak curve, peak at the heading stage. At heading stage, farmers425in D6density maximum leaf area index, farmers427in D4density maximum leaf area index; The effective rate of leaf area, high rate of leaf area, effective leaf area index, effective leaf area index owing to the different varieties and planting density.4. East425and east427farmers sword leaf photosynthetic rate, transpiration rate, stomatal conductance, intercellular CO2concentration were unimodal curve changes after heading, but the peak time owing to the different varieties and planting density, and more concentrated in the19days after the sword leaf extract26days, farmers427peak of photosynthetic rate in12days after the sword leaf extract.5. Planting density only within a certain range, the east425and east427farmers groups of aboveground dry matter weight, stem sheath material output rate, stem sheath material operation rate increases with the increase of planting density, however, dropped when planting density is too large.6. With the increase of planting density, two varieties of rice plant height increases, the center of gravity height up, the shorter spike length, stem diameter and stem thickness thinning; Lodging index and stem elongation internode length1,2were extremely significant positive correlation, and the basal stem roughness were very significant negative correlation, stem thickness. By reducing the first and second elongate internode length, increasing the stem thickness, roughness lower center of gravity height, increase spike length, can improve the KangDaoXing of rice plant. Different panicle rice variety of lodging resistance there is a difference between varieties, panicle number type lodging’resistance of rice varieties farmers427ability stronger than the heavy farmers425rice varieties.7. Per panicle number and grain number per panicle is affected by planting density is opposite bigger, grain affected by planting density is relatively small, the east and east425farmers427per spike, grain number per panicle, seed setting rate and decreased with the increase of planting density, ear number increases with the increase of planting density; Farmers in425has the highest yield in D11density treatment, no significant difference with D9, D10density treatment, think in terms of lodging resistance ability and economic benefit, D9processing for the optimum planting density; Farmers in427has the highest yield in D5density treatment, and there is no significant difference between D3, D4processing, comprehensive lodging resistance ability and economic benefit consideration, D3processing for the optimum planting density.8. Cold japonica group on the number of holes per square metre, every point, every square metre, number of spikelets, seed setting rate, heading stage total dry weight, stem sheath material output rate, stem sheath material availability, a branch number, advantage, advantage and the ratio of the weak grains, leaf area index, photosynthetic rate and yield were significantly or extremely significantly positive correlation.