施氮方式和灌水量对甘蔗农艺性状、 养分累积及产量的影响

目的]探讨不同施氮方式和灌水量对甘蔗生长、养分累积及产量的影响,为合理利用水肥资源实现甘蔗高产高效栽培提供参考依据.方法]以新台糖22号(ROC22)为试验材料,设不施氮肥、不灌水(CK),氮肥作基肥一次性施用、灌水750 mm(T1),氮肥作基施一次性施用、灌水1000 mm(T2),氮肥作基施一次性施用、灌水1250 mm(T3),氮肥分3次施用(基肥30%、分蘖肥30%、攻茎肥40%)、灌水750 mm(T4),氮肥分3次施用、灌水1000 mm(T5)和氮肥分3次施用、灌水1250 mm(T6)7个处理,测定各处理甘蔗农艺性状、各部位养分含量、产量和蔗汁锤度等指标,研究不同施氮方式和灌水量对甘蔗生长与产量的影响.结果]中、高灌水量(1000和1250 mm,下同)时,分3次施氮处理甘蔗的株高高于一次性施氮处理,在5~7月差异显著(P<0.05).在甘蔗成熟期,茎干重表现为T1>T2>T3、T6>T4>T5、T1>T4、T2>T5和T3T4、T2>T5和T3T2>T3、T6>T4>T5、T1>T4、T2>T5和T3T1>T2、T4>T6>T5、T1

Effects of different nitrogen application methods and irrigation amounts on agronomic characters,nutrient accumulation and yield of sugarcane

Objective]The present study revealed the effects of different nitrogen application methods and irrigation amounts on agronomic characters,nutrient accumulation and yield of sugarcane, in order to provide reference for achieving high-yield and high-efficiency sugarcane cultivation through fertilizer resources. Method]With ROC22 as test material, seven different treatments were conducted:no nitrogen and no water (CK), nitrogen as base fertilizer for one time, irrigation amount 750 mm(T1), nitrogen as base fertilizer for one time, irrigation amount 1000 mm(T2), nitrogen as base fertilizer for one time, irrigation amount 1250 mm(T3), nitrogen application for three times(base fertilizer 30%, nitrogen at tillering stage 30%and nitrogen at elongating stage 40%), irrigation amount 750 mm(T4), nitrogen application for three times, ir-rigation amount 1000 mm(T5), nitrogen application for three times, irrigation amount 1250 mm(T6). Agronomic characters, nutrient contents in different organs,yield and sugarcane juice brix were measured to study the effects of different nitrogen application methods and irrigation amounts on sugarcane growth and yield. Result]In medium and large irrigation amounts treatments(1000 and 1250 mm, the same below), the plant heights of sugarcanes in three-time nitrogen applications treat-ments was higher than those in one-time nitrogen application , and the difference was significant between May to July (P<0.05). At maturity stage,dry weight of stalk was T1>T2>T3,T6>T4>T5,T1>T4,T2>T5,T3T4,T2>T5,T3T2>T3,T6>T4>T5,T1>T4,T2>T5,T3T1>T2,T4>T6>T5,T1