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马铃薯合作88号肥料与密度丰产栽培试验 总被引：3，自引：1，他引：2
利用二元二次回归组合设计 ,研究宣威红壤马铃薯专用肥和密度措施对马铃薯产量的影响 ,结果表明 :肥料与密度对马铃薯产量的效应曲线都为开口向下的抛物线 ;产量 >375 0 0kg hm2的优化栽培措施为 :马铃薯专用肥 1937 5 5kg hm2 ,种植密度 4 0 6 2 0株 hm2 。 相似文献
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[目的]采讨类似贵州肖毕节市生态环境下获得较高产量的最佳施肥配比，建立施犯指导数学模型[方法]通过菜用脱毒马铃薯宣薯3号“3414”测土配方施肥肥效试验，分析最佳施肥配比。[结果]中肥力试验施N肥210.3kg/hm^2、P肥36.3kg/hm^2、K肥413.1kg/hm^2,可获得马铃薯18 146.1kg/hm^2；低肥力试验施N肥117.15kg/hm^2、P肥79.8kg/hm^2、K肥191.55kg/hm^2,可获得马铃薯18 610.35kg/hm^2的较好产量；高肥力试验地块由于基础肥力较高，土壤中含N量也能满足马铃薯生长阶段对N元素的需求，故不需要再施用，其最佳施肥量为施P肥242.7kg/hm^2、K肥522.3kg/hm^2,可获得马铃薯18 648.15kg/hm^2的产量[结论]研究结果为大田生产提供了指导。 相似文献
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以肉桂茶树为试材，在春、夏茶采摘后，每hm^2施用茶叶专用肥375kg。结果表明：夏、秋茶施用茶叶专用肥比空白对照芽长增长0．42cm和0．4cm，每hm^2产量增产470kg和380kg，比对照肥料(尿素)芽长增长0．22cm和0．2cm，每hm^2增产200kg和150kg。 相似文献
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研究了不同N、P、K及密度配合，以及化控措施对赣豆4号产量和经济性状的影响。结果表明：处理6（A2B3C1D2)、8（A3B2C1D3）、4（A2B1C2D3）产量最高，分别为2835.84kg/hm^2、2818.08kg/hm^2和2816.28kg/hm^2。密度和K肥对产量影响达极显著水平，N肥影响达显著水平，而P对产量的作用不大。K能促进产量构成因子的形成，提高单株生产力。随着密度增大、N肥用量的增加，株高增加，分枝减少，单株荚数、粒数、单株生产力降低，百粒重减轻。P对促进分枝、提高单株荚数有一定的作用。多效唑、叶面喷肥、钼酸铵拌种、根瘤菌拌种分别比常规种植增产14.39%-5.16%。高产试验平均产量达2673.6-2814.3kg/hm^2，最高产量达3429kg/hm^2，高产示范平均产量2496.5kg/hm^2。 相似文献
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玉米单交种豫玉27号高产栽培措施研究 总被引：1，自引：0，他引：1
采用单因素随机区组设计对豫玉27号（原名洛单94-1）进行密度试验，结果表明：该品种对密度具有广适性，适宜种植密切为45000-75000株/hm^2。采用N、P、K三因素旋转组合设计，通过计算机模拟寻优，建立了豫玉27号的产量-施肥量数学模型；分析了N(x1)、P(x2)、K(x3)的主效应及交互效应与产量的关系，它们对产量的影响大小依次为N、P、K。筛选出玉米产量大于等于108000kg/hm^2的最优方案为：N393.15-399.15kg/hm^2、P2O5171.90-175.05kg/hm^2、K2O167.25-174.60kg/hm^2，其比例为：2.3：1：1。 相似文献
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在浙江省马铃薯主产区丽水市．通过2年试验研究了增施磷钾肥措施对优质马铃薯GP2-12的产量及相关生理性状的影响。试验表明．在当地习惯施肥基础上．同时增施磷钾肥,提高了马铃薯产量、块茎淀粉含量及商品率、叶面积系数、叶绿素含量和净同化率、同时表明．增施磷钾肥的不同处理效果不同．根据增产提质效果及实际效益．推荐施肥量为：N110kg／hm^2、P2O5 80kg／hm^2、K2O 180kg／hm^2、农家肥10^4kg/hm^2。 相似文献
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氮、磷、钾肥对作物的增产效果与适宜施用量的探讨 总被引：1，自引：0，他引：1
根据近几年来南安市甘薯、花生、马铃薯作物主产区田间肥料试验结果,认为施用氮、磷、钾肥能有效地增加马铃薯、花生植株高度和分枝数,提高了马铃薯茎叶重量和花生的总果数、饱果数和饱果率,降低了秕果数,提高单株重量。施肥对作物产量和效益的影响是：甘薯,施肥〉不施肥,钾肥〉氮肥〉磷肥;花生,施肥〉不施肥,钾肥〉氮肥、磷肥;马铃薯,施肥〉不施肥,氮肥〉钾肥〉磷肥。同时,通过建立甘薯、花生、马铃薯在各种土壤类型上的产量和施肥利润与N、P、K三要素施用量的三元二次数学模型,获得作物适宜施肥量。甘薯,空白产量大于21000kg/hm^2,施肥预期最高产量32000kg/hm^2～42000kg/hm^2的中高产土壤的适宜施肥量为154.3～173.6kg/hm^2N,44.4～75.3kg/hm^2P2O5,193.1～245.3kg/hm^2K2O,N：P2O5：K2O=1：0.26～0.43：1.24～1.41;最佳经济施肥量为140.0～162.0kg/hm^2N,40.8～67.0kg/hm^2P2O5,199.9～227.3kg/hm^2K2O,N：P2O5：K2O=1：0.25～0.41：1.23～1.64;花生,适宜施肥量组合为112．7-123．8kg／hm^2N,41．2～64．0kg／hm^2P2O5,186．3-197．6kg／hm^2K2O,N：P2O5：K2O=1：0．37～0．52：1．56～1．69;最佳经济施肥量为74．5～87．7kg／hm^2N,32．0～68．5kg／hm^2P2O5,138．9-163．8kg／hm^2K2O,N：P2O5：K2O=1：0．43～0．85：1．80～2．04;马铃薯,适宜施肥量组合范围为168．2-247．5kg／hm^2N,55．0～88．0kg／hm^2P2O5,255．0～316．7kg／hm^2K2O,N：P2O5：K2O=1：0．22～O．48：1．28～1．53;最佳经济施肥量为168．2～233．2kg／hm^2N,61．4～81．4kg／hm^2P2O5 257．2-286．4kg／hm^2K2O,N：P2O5：K2O=1：0．26～0．48：1．23～1．61。 相似文献
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[目的]探索和集成杂交玉米新品种贵卓玉9号的高产栽培技术。[方法] 2017年进行了播种期、密度、施肥量单因子试验。[结果] 4月9日播种的产量最高,为12 383.85 kg/hm^2,4月1日播种的产量为12 189.15 kg/hm^2位居第二,最佳播期在4月1-9日之间;在密度49 500株/hm^2时产量12 533. 10 kg/hm^2为最高,密度57 000株/hm^2的产量为11 929.95 kg/hm^2位居第二,最佳密度在49 500-57 000株/hm^2之间;当施肥量达900 kg/hm^2时产量12 383.10 kg/hm^2为最高,施肥量750 kg/hm^2的产量11 848.80 kg/hm^2位居第二,最佳施肥量在750-900 kg/hm^2之间。[结论]结果为贵卓玉9号的推广种植奠定基础。 相似文献
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Four levels of nitrogen, 188, 285, 358 and 392 kgJ.ha (150, 225, 285 and 350 units/ac) supplied as anhydrous ammonia were injected on each of four occasions, 18 Dec, 5 Feb., 12 Mar. and 16 Apr. DM and CP yields were estimated at each of three harvests taken on 4 June, 19 July and 28 Sept Total DM yields showed only a 10% difference between the highest yielding injection date, 12 Mar., which yielded 12270 kg/ha (10946 Ib/ac) and the lowest, 16 Apr., which yielded 11169 kgJ.ha (9963 Ib/ac). Early injection of ammonia promoted growth during the late spring and later injections resulted in increased yields at the two later harvests. The responses per kg fertilizer N were 11.9 kg DM (10.8 lb/unit) and 3.6 kg CP (3–3 Ib/unit). It was concluded that ammonia should be applied to grassland before April and, preferably, during March, for maximum yields of DM and CP. 相似文献
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Considerable improvement has been achieved in rough grazings by fairly frequent close mowing with the forage harvester or flail mower, particularly when combined with manuring and surface seeding.
The implement has proved capable of tackling very tough vegetation and converting it into grazing swards of fair value and good botanical composition. Undesirable species have been largely eliminated by treatment over two growing seasons.
The method is believed to compare favourably in cost with sward renovation by cultivation or by herbicides. 相似文献
The implement has proved capable of tackling very tough vegetation and converting it into grazing swards of fair value and good botanical composition. Undesirable species have been largely eliminated by treatment over two growing seasons.
The method is believed to compare favourably in cost with sward renovation by cultivation or by herbicides. 相似文献
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With modern machinery and modem techniques of grass production, mechanical-or zero-grazing offers a means of utilizing the crop to perfection. Whether this results in enhanced profits depends largely upon the farm and the specific circumstances. It may, it may not. What is evident is that the health of the cows is not affected by an unnatural manner of summer feeding; the sward, per se, may be improved by the regular and uniform defoliation; and under conditions of intensive production and the vital need to use profitably every blade of grass, as for instance on small, highly-rented farms, the practice of zero-grazing merits the most careful consideration. It cannot lightly be dismissed as merely a new fad. 相似文献
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THE USE OF THE IN VITRO TECHNIQUE IN THE DETERMINATION OF THE DIGESTIBILITY OF GRASS/LEGUME MIXTURES
The in vitro dry-matter digestibility was determined of two samples of Digitaria decumbens , one sample of Medicago sativa , and one sample of Trifolium repens and nine mixtures prepared from these samples.
When the results were compared with in vivo digestibilities the standard errors of the regressions for the three combinations of legume, grass and legume/grass mixtures were ±0.6, ±0.6 and ±1.5 percentage units, respectively.
It is considered that in vivo digestibility of mixtures of grasses and legumes can be estimated by the in vitro technique, provided that suitable grass and legume standards are included. 相似文献
When the results were compared with in vivo digestibilities the standard errors of the regressions for the three combinations of legume, grass and legume/grass mixtures were ±0.6, ±0.6 and ±1.5 percentage units, respectively.
It is considered that in vivo digestibility of mixtures of grasses and legumes can be estimated by the in vitro technique, provided that suitable grass and legume standards are included. 相似文献
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The effect of temperature on silage quality was investigated in a series of trials over a period of three years.
The results indicated that when conditions in the silage were favourable for the formation of lactic acid, either through treatment or because of the herbage itself, low temperatures in the mass had no adverse effect on silage quality.
Some results suggest that, with chopped or lacerated silage, low maximum temperatures are associated with better quality silage. The results, however, were not entirely consistent.
There appeared to be little or no advantage in allowing unchopped silage to heat to 100°F. 相似文献
The results indicated that when conditions in the silage were favourable for the formation of lactic acid, either through treatment or because of the herbage itself, low temperatures in the mass had no adverse effect on silage quality.
Some results suggest that, with chopped or lacerated silage, low maximum temperatures are associated with better quality silage. The results, however, were not entirely consistent.
There appeared to be little or no advantage in allowing unchopped silage to heat to 100°F. 相似文献
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Thirty-one sets of N yield data were considered, taken from seven experiments grazed by sheep. N yield could be explained in terms of fertilizer N rate, an estimate of soil N and an interaction between the two. Fertilizer N increased grass N yield more on grazed swards than on cut swards, and this effect was greatest on soils with high available soil-N. It is concluded that N recircula-tion can be substantial on heavily-stocked swards receiving high rates of fertilizer N, so increasing the efficiency of fertilizer as a source of N in these conditions. 相似文献