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半夏高产栽培技术研究
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摘要
本课题通过田间栽培试验,研究了半夏播前催芽、薄膜覆盖、播种量、施肥水平、采收时期、以及玉米密度对半夏产量的影响。
     结果表明:催芽并覆盖地膜的栽培方式可大幅度提高半夏产量(增产约30%);最合理的用种量为120 kg/667m~2;随着施肥量的增加,半夏产量显著提高,当每667m~2施肥水平达到N、P_2O_5、K_2O分别为52.74 kg、16.70 kg、28.72 kg时,半夏产量最高,增产效果最好(比不施肥处理增产50%以上);当地半夏适宜的采收期在9月中下旬至10月上旬;增加玉米密度虽然能够增产,但增产效果不明显。
     研究得出,在催芽、盖膜、催芽盖膜、用种量、施肥水平、采收期和玉米间作密度7个试验因子中,对半夏产量有明显影响的因素主要是施肥水平和播种量,但是在产量、投入产出比和经济效益同时兼顾的条件下,半夏播种量以每667 m~2播种120 kg为宜,在半夏的一个生育过程中,以每667 m~2施用氮肥、磷肥、钾肥的总量分别为52.74 kg、16.70 kg、28.72 kg为宜。播种量对半夏产量的影响大于施肥水平。
     在本实验的基础上总结相关资料,提出半夏间作玉米的高产栽培技术要点为:选择肥沃、疏松、保水保肥能力较强的土壤,冬翻20-25 cm;播种前用5%的草木灰或50%多菌灵可湿性粉剂1000倍液浸种消毒2小时,捞出晾干后移入大棚内或用火坑、电炕催芽15-20天,温度宜控制在20-25℃;盖膜前要先浇足水,保证土壤湿润,盖膜要做到紧、平、严;整地时每667 m~3施2000 kg腐熟厩肥、25 kg钙镁磷肥和25 kg硫酸钾作为基肥。齐苗和第一次、第二次倒苗之后各追施一次肥料,每次追肥以每667 m~2用20 kg油饼兑500 kg人粪尿追施为宜。半夏的整个生育过程中氮肥、磷肥、钾肥的施用量分别控制在N为52.74、P_2O_5为16.79、K_2O为28.72 kg为宜;播种量应掌握在120 kg/667 m~2,玉米密度以40 cm×50 cm的株行距为宜;松土、培土宜进行3次,分别在苗齐和第1次、第2次倒苗后,先施追肥再培土。松土时用小锄头在畦面上浅锄5-8 cm(以不超过播种深度为宜),松土后从畦沟内取碎土均匀撒于畦面,厚约1.5厘米左右;及时浇水以保持土壤湿润,土壤含水量以28-40%为宜,若土壤含水量过高,要及时排水;病虫害防治要做到早发现、早处理、措施得当;采收的最佳时期为9月下旬至10月上旬,苗枯后及时采挖。
This study focuses on how sprouting,biodegradable mulch film covering,seeding rate,levels of fertilizer application and different picking times effected on Pinellas ternate(Thurnb.) Bruit yield through field-planting experiments.
     Conclusion:sprouting along with biodegradable mulch film covering could increase production in a great extent(increase approximately 30);the most suitable seeding rate was 120kg/667 m~2;though adjustment of corn density could increase production,the effect wasn't so significant.The yield increased remarkably as the fertilizer application increase,it reached its peak when the Nitrogen,N、P_2O_5、K_2O use at a level of 52.74 kg,16.70 kg,28.72 kg per 667 m~2 respectively;as far as local Pinellas ternate(Thumb.) Bruit is concerned,middle Sept.to early Oct.was the best picking time.
     The technique points of Pinellas ternate(Thumb.) Bruit are as fallows:selected nutrients-rich,porous,water-holding,fertilizer-holding soil and plowed deep to 20-25cm before the planting year;immersed seeds with 5%plant ash or 50%carbonados wet table powder for 2 hours,moved them into great tent or heated them under 20-25℃by fire or electrical heater after draining and drying;watered soil enough before covering mulch film,made sure the mulch film tight,plain and sealed;fertilize 2500 kg rotted manure,50 kg FCMP and 50 kg Potassium soleplate per 667 m~2 as basal fertilizers when mounded the earth.Added 50 kg oil seeds scum plus 1000 kg human faces per 667 m~2,of which was the most suitable level,when sprouting,the first and the second sprout-tumbling time came respectively.The reasonable NPK utilization in the whole reproductive process of Pinellas ternate(Thumb.) Bruit should be respectively controlled at a level of 116.1 kg,28.35 kg,48.8kg per 667 m~2;and the seeding rate be controlled at a capacity of 120 kg per 667 m~2,while corn density be kept at a 40 cm×50 cm row spacing;decomposed, mounded topsoil 3 times respectively when sprouting,the first and the second sprout-tumbling time arrived,then fertilized and mounded in turn.Made a 5-8 cm shallow ditch on the top of the mound with a small hoe when made the topsoil porous(within the sowing depth),then took some earth from the bottom of the mound and spread evenly in a 1.5 cm layer on the top of the mound;watered it in time to make sure soil humid within a level of 28-40%,drained it in time when the soil contains too much water;kept an eye on pest and fungi,then took suitable measures and dealt with it as soon as possible;the best harvest time began from middle of Sept.to early Oct.,dug them out shortly after their leaves and stalks began to decompose.
     In summation,of all the seven factor:sprouting,mulch film covering,seeding rate, corn density,levels of fertilizer use and picking time,the most significant factors for Pinellas ternate(Thumb.) Bruit yield were levels of fertilizer application and seeding rate through experiments.Considering its production,cost-effectiveness and economic efficiency,the best seeding rate was 120 kg per 667 m~2,while the most suitable N,P,K use was 52.74 kg、16.70 kg、28.72 kg per 667 m~2 respectively in a life-death circle of Pinellas ternate(Thumb.) Bruit.Seeding rate played a relatively more important role upon Pinellas ternate(Thumb.) Bruit than fertilizer use.
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