免耕抛秧栽培水稻的氮磷钾配施及其效应研究
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摘要
本试验以三系籼型杂交水稻金优253为供试品种,采用“3414”方案设计,研究了不同的氮肥、磷肥、钾肥施用量配比对免耕抛秧栽培水稻的效应。主要研究结果如下:
     1、氮磷钾合理配施能有效地促进水稻分蘖,增加叶片叶绿素含量,保证足够的干物质积累并增加了株高。本试验中以每667m~2施13-19.5 kg N、3.6 kg P_2O_5、9 kgK_2O对水稻生长效果最好。
     2、氮磷钾合理配施可以增加水稻产量。本试验中以每667m~2施13 kg N、3.6 kg P_2O_5、9 kgK_2O得到的产量、产值和收入都为最高,分别为517.16 kg/667m~2、775.74元/667m~2和670.60元/667m~2。
     3、合理施用氮磷钾肥料能显著增加每穗粒数和有效穗数,过量施氮对结实率不利,氮磷钾肥不同施用量对千粒重都无显著影响。产量各构成因素与产量都成正相关关系,其中每穗粒数与产量成显著正相关。本试验中以每667m~2施13 kg N、3.6kgP_2O_5、9kgK_2O时产量各构成因素之间关系比较协调,最有利于产量的增加。
     4、氮磷钾肥配施对土壤有机质和碱解氮含量无显著影响,施用磷肥可使速效磷含量比种植前提高2.86-13.69 mg/kg。土壤钾素在种植后有一定的亏缺,不施钾肥的处理亏损较多,施用高量钾肥的处理亏损较少。
     5、本试验中常规施肥量下水稻吸收养分量为氮素18.05 kg/667m~2,磷素3.00 kg/667m~2,钾素14.94 kg/667m~2。施氮是保证植物正常吸收磷和钾的重要条件,不施磷肥对水稻吸收氮和钾的量并无显著影响,不施钾肥对水稻吸收氮和磷影响不大。
     6、运用肥料效应函数法和养分平衡法分别推荐出了不同的施肥量。综合分析提出在本试验条件下的氮、磷、钾肥推荐施用量:每667m~2施N13-16 kg,P_2O_5 4-6kg,K_2O 10-12.kg,此时可获得水稻产量500-550 kg/667m~2。
By using the species of rice hybrid Jinyou 253 and adopting "3414" project design, the field experiments were conducted to study the effect of nitrogen, phosphorus and potassium combined application on rice seeding-broadcasting cultivation with no-tillage. The main results are as follows:
     1.Matching the appropriate amount of N, P_2O_5 and K_2O increased the tillers, the chlorophyll content and plant height, and also ensured adequate dry matters. Combined application of 13-19.5 kg N per 667m~2, 3.6 kg P_2O_5per 667m~2 and 9 kg K_2O per 667m~2 was the best for the growth of rice under this experimental condition.
     2. Matching the appropriate amount of N, P_2O_5 and K_2O increased the yield of rice. The highest yield, output value and income, which were 517.16kg/667m~2, 115.14 yuan/667m~2 and 670.60 yuan/667m~2 separately, were gained with application of 13 kg N per 667m~2, 3.6 kg P_2o_5per 667m~2 and 9 kg K_2O per 667m~2 under this experimental condition.
     3. Matching the appropriate amount of N, P_2O_5 and K_2O increased the grains per spike and the effective panicle number. Excessive application amount of N reduced the seed setting rate while the seed setting rate was not affected by the application amount of P_2O_5 and K_2O. The 1000-grain weight was not affected by the application amount of N, P_2O_5 and K_2O. The yield of rice was positively related to its componeat factors. The relationship of the yield of rice and its component factors were reasonable with application of 13 kg N, 3.6 kg P_2O_5 and 9 kg K_2O per 667m under this experimental condition.
     4. Different ratio of N, P_2O_5 and K_2O had not significant effect on the organic matter and the alkali-hydrolyzable N in the soil. The available P in the soil was significant affected by different application amount of P2O5, which increased 2.86-13.69 mg/kg after harvesting. Available K in the soil showed a little deficit to a certain extent. The treatments without application of K showed more K deficit than the treatments with application of K_2O.
     5. 18.05 kg N per 667m~2, 3.00 kg P_2O_5 per 667m~2 and 14.94 kg K_2O per 667m~2 was absorbed by rice with the conventional fertilizer application amounts. Enough N insured rice to absorb P and K, but the absorbtion of N was not affected without the application of P and K.
     6. Defferent fertilizer amount was recommended respectively by method of fertilizer effect function and nutrient balance method. Fertilizer amount recommended could be obtained considering the two methods synthetically under this experimental condition: the fertilizer amount could be 13-16 kg N per 667m~2, 4-6 kg P_2O_5 per 667m~2 and 10-12 kg K_2O per 667m~2 while the yield of 500-550 kg/667m~2 could be gained.
引文
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