Development of crop management techniques for higher yield by optimun control of root zone environment

为了快速方便地对根际土壤进行取样，并用于生物量的测定，采用了“根箱”，该根箱被不锈钢网眼织物分成3个隔室。在番茄栽培试验中，根际土取样法与手指取样法相比，明显地看出了根箱的作用。这些覆盖方式或行覆盖类型的差异会影响行覆盖下的小气候和根区的热环境。为了阐明行覆盖下的小气候和根区的热条件，我们给出了观测结果，并将这些结果与数值试验结果进行了比较。模拟实验和观测结果之间可以得到相当合理的协议。植物的生长不仅与积温有关，而且与行被与土壤表面之间的太阳辐射有关。 ...更多信息 本文报道了加拿大阿加西研究站对茄子行覆盖栽培中地膜覆盖材料颜色的试验结果。产率为绿色棕黑色透明。原因被认为是覆盖物。覆盖材料对覆盖面以上部分的反射光和土壤加热都有影响。效应，即绿色色彩效应使植物开花促进。另一方面，覆盖材料的价格为绿色棕黑色透明材料，因此，覆盖材料的价格与蔬菜产量之间没有相关性。指入作为优先途径是田间非饱和水分运动模拟模型中最难考虑的问题之一。今年，我们研究了指进所造成的不稳定的湿润锋运动的结果，在均匀的，两层土壤，上层是细，比下面的层比粗导电性差。少

In order to sample the rhizosphere soil quickly and easily for biomass measurement, " rhizobox which was divided into 3 compartments by stainless mesh fabrics was applied. Utility of rhizobox was observed clearly as compared with the sampling method of rhizosphere soil by finger in the experiment of tomato cultivation.There are many kind of row covers, each differing in material and prosity. these differences in covering method or row cover type can affect the microclimate under the row cover and thermal environment of root zone. To clarify the microclimate under the row cover and the thermal conditions at the root zone, We presented the observation results and compared these results with the numerical-experiments results. Fairly reasonable agreement can be obtained between simulation experiments and observation results. ' The plant growth is not only relaed to the accumulated temperature but also to the solar radiation between row cover and soil surface.It is interested that the resul … More ts of the experiment on the color of plastic mulching materials in row mulch cultivation of egglpants at Agassiz Research Station, Canada. The yields was in the order of green brown black transparent one. The reason was thought to be the mulch. materials could effect to the upper part above the mulch surface in reflecting of light from mulch as well as soiI heating. effect, that is, green color effected to make flowering of plants promote. On the other hand, price of mulch materials is in the order of green brown black transparent one, therefore, there was no correlation between price of mulch materials and vegetable yields.Fingering behaving as the preferential-pathways is one of the most difficult problems to consider the simulating model of unsaturated water movement in the field. This year, we studied the fingering caused as the result of unstable wetting front movement in homogenious, two layered soil whose upper layer is finer and less conductive than the coarser than layer beneath. Less