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本项试验虽然方法简单和历时较短,但就所得结果,可初步得到以下几点体会: 1.追肥是提高冬黑麦两次青刈产量的一个基本途径。每亩施硝酸铵80斤和硝酸铵40斤+过磷酸钙80斤的,分别提高产量37.37%和31.72%。其中单施硝酸铵的产量最高,而单施猪圈粪的增产不显著。因此,为了提高青刈冬黑麦两次刈割的产量,早期追施化学肥料,特别是施用溶解性高和含氮丰富的硝酸铵,可以荻得最大的经济效益。按亩施硝酸铵80斤,增产青饲料738.5斤计算,则每亩肥料成本仅10元左右,而所得效益则达20多元,但更主要的近是早期为养畜业提供了大量的优质青饲料,对于促进畜体健康发育和提高生产量具有更为重要的意义。 2.一次青刈的冬黑麦,单施硝酸铵的产量最高,硝酸铵加过磷酸钙的居次,二者依次增产41.16％和39.83％;单施猪圈粪的效果不显著,仅增产3.32％。因此,一次青刈的冬黑麦,也和两次刈割一样,用作追肥的都应以化学肥料为主,多施速效的氮素肥料。 3.早期追肥也是提高籽实产量的一项重要措施,不论是施用速效的硝酸铵或过石,也不论是迟效的猪圈粪,增产效果均甚显著。一次刈割收获籽实的,以硝酸铵加过磷酸钙的最高产,增中64.82%;单施硝酸铵居次,增产59.03%;单施猪圈粪的也增产14.34%。两次刈割,利用再生草收获籽实的,追肥效果与一次刈割有相同的趋势。因此,为获得籽实的高额产量,早期追肥也是十分必要的。如按每亩硝酸铵40斤、过磷酸钙80斤,增产148.07斤计算,则每亩仅追肥一项即增加2—3元的收入。
Although the method of this test is simple and lasted for a short time, the results obtained are as follows: 1. Top-dressing is one of the basic ways to increase the yield of winter mulching twice. 80 kg of ammonium nitrate per acre and ammonium nitrate 40 kg + 80 kg superphosphate, respectively, to increase production 37.37% and 31.72%. Among them, the yield of ammonium nitrate alone was the highest, while the increase of pig manure alone was not significant. Therefore, in order to increase the yield of mulching two rounds of mulching, the economic benefits of chemical fertilizers early, especially the application of ammonium nitrate with high solubility and rich in nitrogen, can maximize the economic benefits. According to the calculation of acreage of 80 kg of ammonium nitrate and an increase of 738.5 kg of green feed, the cost of fertilizer per acre is only about 10 yuan while the benefit gained is more than 20 yuan. However, the more important is that it provides a large amount of high- For the promotion of carcass health development and increase production has more significance. 2. A winter milled winter rye, the highest yield of ammonium nitrate alone, followed by ammonium nitrate and calcium superphosphate, followed by an increase of 41.16% and 39.83% respectively; the effect of single pig manure was not significant, only an increase of 3.32 %. Therefore, a green tillable winter rye, and the same as the two mowing, should be used as top dressing chemical fertilizers, more nitrogen fertilizer application speed. 3. Early dressing is also an important measure to increase the yield of seed, no matter it is quick-acting ammonium nitrate or over-stone, and no matter it is delayed-acting pen trumpet, the yield increase effect is very significant. A mowing harvest of seeds, with ammonium nitrate plus calcium superphosphate highest yield, an increase of 64.82%; single application of ammonium nitrate secondary, yield 59.03%; single pigsty manure also increased yield 14.34%. Two cutting, the use of recycled grass harvest seed, dressing effect and a cut the same trend. Therefore, in order to obtain high yields of seeds, early top dressing is also very necessary. For example, 40 kg of ammonium nitrate per acre, 80 kg of superphosphate, an increase of 148.07 kg, then only one fertilizer per acre, an increase of 2-3 yuan in revenue.