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1.晚稻植株的不同器官对氮素供应状况的反映不同,其中叶片較为敏銳。而同一器官在不同生育时期內影响也不一样谂柙缘奶跫?叶片在分蘖期中,氮素供应強度大、持續时間短比強度小、持續时間长的处理更能促进叶片干物貭累积,增大叶面积。而拔节期以后,影响不明显并略有相反趋势。对于茎稈則在供应強度大及其持續时間短的情况下,不論拔节期或分化期处理都明显地促进其干重的增加。穗粒的形成条件却是強度小而持續时間长的有利于每穗粒数的提高。但是,氮素供应状况的影响显著与否还可能受着基肥水平的制約,在高量基肥的条件下影响极不显著。2.土壤氮素供应状况影响器官生长的原因,初步看来是通过对植株体內氮素累积和运轉速度的影响而发生作用。由于不同生育时期內,叶、鞘、茎、穗本身的生长特点各异,所要求的物貭累积与运轉的強度也各不相同。因此,氮素供应状况对器官生长的影响也就不全相同。3.根据試驗結果,初步认为水稻对土壤氮素供应状况的要求是分蘗初期緩而长,拔节期快而短,穗分化期緩而长。因此,結合不同土壤的供肥特点需要利用有机厩肥或速效化肥等性貭不同的肥料在次数及用量上加以調节。4.初步认为施肥原則掌握的主要內容是根据水稻器官协調生长的需要以調节土壤的氮素供应強度及其持續时間,造成最和諧与最有效的土壤——植物供求关系。
1. Different organs of late rice plants respond differently to the status of nitrogen supply, of which leaves are more sensitive. However, the same organs had different effects during different growth stages. In the tillering stage, the nitrogen supply intensity was higher, the duration shorter than the intensity, and the longer duration of treatment could promote the leaf dry matter貭 accumulation, increase the leaf area. After the jointing period, the impact is not obvious and the opposite trend. In the case of stalks, when the supply intensity is large and its duration is short, the increase of dry weight is obviously promoted at the jointing stage or the differentiation stage. Spike grain formation conditions are low intensity and long duration is conducive to the grain per spike. However, whether the impact of nitrogen supply is significant or not may also be affected by the basal fertilizer level, with no significant effect at high basal fertilizer rates. 2. The cause of soil nitrogen supply affecting organ growth initially appears to play a role through the effect of nitrogen accumulation and running speed on plant body. As different growth stages, leaves, sheaths, stems, spikes own growth characteristics vary, the required strength and strength of the accumulation and operation of objects vary. Therefore, the effect of nitrogen supply on organ growth is not the same. According to the experimental results, it is preliminarily thought that the requirement of rice nitrogen supply to soil is that the early tillering is slow and long, the jointing period is short and fast, while the ear differentiation stage is slow and long. Therefore, the combination of different soil fertilization characteristics need to use organic manure or quick-acting fertilizer and other nutrients 貭 different fertilizer in the number and dosage to be adjusted. It is initially believed that the main content of the fertilization principle is to adjust the nitrogen supply intensity and duration of the soil according to the needs of coordinated growth of rice organs, resulting in the most harmonious and effective soil-plant supply and demand relationship.