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(—)四川省农业科学研究所试验结果1.低量混合肥的肥效是否相当于多量堆肥?从试验结果已得到解答了。在不施用追肥环境下,低量混合肥的生长情况和稻谷产量和多量堆肥(每亩4000斤)表现一致性,但在同用追肥的环境下,低量混合肥区的生长情况较好,惟倒伏较为严重,因此其每亩产量反比多量堆肥区少了10斤。2.高量混合肥是否比低量混合肥的效果好呢?在同施追肥条件下,从生长情况来看,高量混合肥区比低量混合肥区占优势,又高量混合肥的稻秆产量也比低量混合肥区多些。可是由于倒伏较为严重,高量混合肥区的每亩稻谷产量,几与低量混合肥区相等。3.施用低量混合肥还需不需要施用追肥?从水稻生长情况和产量来此较,低量混合肥加施追肥区,共生长情况要比不加施追肥者好一些。可是由于倒伏的影响,加施追肥区和不加施追肥区增产不多。如与肥料价值比较,也是得不偿失的。因此,在中等肥力的土壤上施用了混合肥是否需要追肥,还须根据具体情况来决定。4.组成混合肥的成分是否可以缺用石灰或缺用磷矿粉呢?通过试验证明,高量混合肥中缺用石灰或缺用磷矿粉,其产量有不但不及高量混合肥,也不及低量混合肥的趋势。总的说来,就水稻生长现象来看,施用混合肥区初期生长较慢,后期表现较为优良。而凡施用追肥者,水稻生长虽然显示较好,但由于倒伏的影响,增加产量有限,反不若未倒伏者之优越。再从产量上来此较,同在不施追肥条件下,低量混合肥与多量堆肥的效果是一致的。同在施用追肥条件下,低量混合肥与高量混合肥效果上差异甚微。低量混合肥施用在中等肥力以上的稻田,再施用追肥显示效果不大,不符合经济原则。(二)各地国营农场和农业生产合作社的试验结果1.在不同气候、地形、地势及土壤条件下进行试验结果证明,低量混合肥的效果不但相当于而甚至还可超过多量堆肥(每亩堆肥4000斤)。前者十四处的平均产量为每亩630.3斤,较后者十四处平均每亩产量600.1斤增加30.2斤,相当4.4%。2.水稻田施用混合肥增产的原因,似不能过分强调土壤酸碱度的作用。3.施用了混合肥的产量,不但比多量堆肥产量高,而且成本低廉。在农村缺肥情况下,也是一种开辟肥源提高产量的良好办法。
(-) Sichuan Institute of Agricultural Sciences Test results 1. Low-level fertilizer is equivalent to the amount of fertilizer compost? From the test results have been answered. Under the condition of no topdressing, the growth of low-level compound fertilizer and the consistency of large-volume compost (4000 kg / acre) were consistent. However, the growth of low-volume mixed- However, the lodging is more serious, so its yield per mu is inversely less than the compost area by 10 kg. Whether the high-level compound fertilizer is better than the low-level compound fertilizer? Under the condition of the same top dressing, the growth rate of the high-level compound fertilizer is higher than that of the low-level compound fertilizer, Rice straw yield than the low amount of mixed fertilizer more. However, due to the more severe lodging, the yield per mu of paddy in high-yielding mixed fertilizers is equivalent to that of low-volume mixed fertilizers. 3. The application of low amount of fertilizer need to be applied top-dressing? From the rice growth and yield to this, a small amount of mixed fertilizer plus top-dressing area, the growth of a total of better than without top dressing. However, due to the effects of lodging, the top-dressing and top-dressing areas in Gashoung yield little. If compared with the value of fertilizer, but also worth the candle. Therefore, the application of fertilizers on medium-fertility soils needs to be top-dressing, it must also be decided on a case by case basis. 4. Whether the composition of the compost can be lack of lime or lack of phosphate rock? Test proved that the lack of high-level fertilizer or lack of phosphate rock phosphate production, the yield is not only less than the high amount of fertilizer, but also Less than the trend of low amount of fertilizer. In general, the growth of rice shows that the initial application of compound fertilizers grows slowly in the early stage and performs better in the later stage. While those who apply top dressing, although the growth of rice showed better, but due to the impact of lodging, increase production is limited, anti-if not outstanding superior. Again from the production up this, with the same conditions in the absence of topdressing, the low amount of mixed fertilizer and the effect of large amounts of compost is the same. With the application of top dressing conditions, the low amount of mixed fertilizer and high amount of mixed fertilizer effect is minimal. Low-level fertilizer application in medium fertility paddy fields, and then applied top dressing shows little effect, does not meet economic principles. (II) Test results of state-owned farms and agricultural cooperatives in various places 1. The test results under different climates, topographies, topography and soil conditions have proved that the effect of low-level compound fertilizers is not only equivalent to but even exceeds that of large amount of compost Compost 4000 pounds). The average yield of the former 14 plants was 630.3 kg per mu, an increase of 30.2 kg or 4.4% over the latter of 14 plants with an average yield of 600.1 kg per mu. 2. Paddy fertilizer application of fertilizers reasons, it seems not too much emphasis on the role of soil pH. 3. The application of mixed fertilizer production, not only than the large amount of compost yield, and low cost. In the case of lack of fertilizer in rural areas, but also a good way to open up fertilizer sources to increase production.