해바라기(Helianthus annuus L.)의 混作可能性에 關한 硏究 : Ⅰ. 콩(Glycine Max. M.)과 해바라기 混作의 生産性에 關한 試驗 Ⅰ. Productive Responses of Accompanion Cropping of Soybean (Glycine Max. M) and Sunflower. (Helianthus annuusL.) Ⅱ. 고구마(Ipomoea batatas P.)와 해바라기 混作의 生産性에 關한 硏究 Ⅱ. Productive Responses of Accompanion Cropping of Sweet Potato (Ipomoea batatas P.) and Sunflower. = Studies on the Accompanion Cropping Possibility of Sunflower
Experment I. Productive Responses of Accompanion Cropping of Soybean and Sunflower
To improve the cropping pattern as well as increasing the land utilization, an investigation was made on the introduced inter and accompanied cropping with sunflower in the soybean field planted after barley harvest.
Treatments such as monoculture of soybean and sunflower, 2 levels of accompanied croppings and 3 levels of inter croppings were compared at experimental farm of Crop Experiment Station, Suweon in 1974 and several important agronomic traits were observed.
The results obtained could be summarized as follows.
1. A tendency increasing stem length, decreasing number of branches and stem diameter of soybean in dencely planted plot of sunflower was observed.
2. Number of pods per plant was decreased in inter cropping compare to the accompanied cropping, which supposedly the results were brought due the influence of inter cropped sunflower as compared to the accompanied one to the growth of after flowering of soybean.
3. Number of grains per pod in soybean was changed in accordance with the changed cropping pattern. In general, accompanied cropping have showed intermediate grain number per pod.
4. No differences in 1000 grain weight of soybean between soybean monoculture and accompa-nied cropping, but the sunflowers intercropped have influenced greatly of soybean growth and accordingly 1000 grain weight was decreased remarkably.
5. Stem length and number of leaves per plant in sunflower were not affected by the cropping pattern but varietal specific charaterictics.
6. Diameter of stem and head radius of sunflower did not show any difference in accompanied cropping plot and intercropped plot which spaced more sparse than 25㎝ between plants. However, intercropped plot with 180㎝ of row spacing and 15㎝ plant spacing as well as mono culture of sunflower spaced as 60㎝×25㎝ produced slender stem and remarkably short head radius.
7. Fresh weight per plant of sunflower was not greatly different between the level of accompanied cropping, but was decreased by increased plant spacing in inter cropping. However, fresh weight per 10a was determined by the number of plants per hill in accompanied cropping, but it was low in dencely planted plot particularly in 15㎝ plant spacing in inter cropping.
8. 1000 grain weight of sunflower was remarkably decreased by increased plant population regardless the employed cropping pattern. Therefore, further researches on the basis of nutritional relations in sunflower should be investigated.
9. Soybean monoculture yielded 176.8㎏/10a was higher than sunflower monoculture of 69.2㎏/10a in grain weight. In cropping pattern, single cropping of soybean accompanied with sun-flower planted 120㎝×60㎝ was shown less decrease in soybean yield and more increase of sunflower yield and also LER exceeded 1.2.
10. Due to the differences of cropping pattern in terms of actual population of soybean, accompanied cropping with sunflower produced higher yield in soybean. However, it was learned that the accompanied cropping had an advantage for increasing sunflower yield through controlling sunflower population.
Experiment II. Productive Responses of Accompanion Cropping of Sweet Potato and Sunflower
Two different cropping patterns with each sunflower variety namely the right season cropping and after barley harvest cropping of sweet potato “Hwangmi” with sunflower cultival “Native”and “Peredovic”respectively, were combined in study of this experiment. Treatments such as mono-culture of sweet potato and sunflowers, and 5 levels of population densities in each cropping pattern were compared at Crop Experimental Farm of Agricultural College, Seoul National University, Suweon in 1974 and several important agronomic traits were obtained. The results obtained could be summarized as follows.
1. Sweet potato has shown a tendency decreasing the rate of growth, yield components and yield height significantly in accompanion croppings comparing with monoculture, both cropping patterns. Also a tendency decreasing the rate of those components in dencely planted plot of sunflower was observed, but no significances. In most rates of accompanion cropping of the right season culture of sweet potato, the yield was no more of less than 20% of monoculture, however of the after barley harvest culture the yield was observed increasing much more than the former case. This tendency is thought due to the fact that “Peredovic”cultivar planted as an accompanion crop of sweet potato is much smaller in height than native cultivar, and influenced less competition with sweet potato for both soil nutrient and light than the native.
2. The yield and productivity of sweet potato responsed very sensitive against the light intensity in both stages for forage and root making. Therefore this crop is considered to be not suitable as a major accompanion crop with sunflower, or should be accompanied with more small crop than sunflower in height.
3. The native sunflower cultivar was observed to be an ideal for monoculture system due to it’s great variation capability of the characteristics of yield factors, however not suitable for accompanion cropping due to it’s characteristics like long plant height, strong nutrient needs, and high hul percent. On the other hand, sunflower cultivar “Peredovic”has shown its superiority as an accompanion crop due to its large adaptation capability on planting date, small plant height, and low hull precent etc.
4. The productivity per unit area was studied by application of Land Equivalent Ratio (LER) test of both crops in combinations. Most LEFSs were not exceeded 1.0 in treatments of accompanied planting density, and, more over, in individual crop yield was decreasing by decreasing of accompanied planting spaces. In this experiment, the range of accompanied planting space was established too narrow, but through controlling of sunflower population and choosing of a suitable accompanion crop it will surely be cleared that the possibility of sunflower production with reasonable yield by the accompanion cropping system.
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