论文部分内容阅读
以水稻为例,应用“3414”试验结果建立浅丘平坝区氮、磷、钾施肥技术指标体系.以缺素区相对产量50%,70%,80%,90%和95%为标准将浅丘平坝区紫色水稻土碱解氮、有效磷、速效钾划分为低、中、较高和高4个级;并分别用一元二次和线性加平台模型对不同土壤养分分级范围内施肥量与产量关系进行模拟,计算最佳肥料用量.结果表明,当土壤碱解氮(AN)处于<100,100~130,130~150和>150mg/kg时,氮肥(N)推荐用量分别为150~165,135~150,120~135和0~120kg/hm2;当有效磷(AP)处于<3,3~4,4~6和>6mg/kg时,磷肥(P2O5)推荐用量分别为90~105,80~90,45~80和0-45kg/hm2;当速效钾(AN)处于<60,60~70,70~90和>90mg/kg时,钾肥(K2O)推荐用量分别为75~80,70~75,60~70和0~60kg/hm2.
Taking rice as an example, applying the test results of “3414” to establish the index system of nitrogen, phosphorus and potassium fertilization in shallow hill area of Pingqiu, taking the relative yield of 50%, 70%, 80%, 90% and 95% as the standard The contents of available nitrogen, available phosphorus and available potassium in purple paddy soils of Shanyu-Pingba area were divided into four levels of low, medium, high and high. Fertilization of different paddy soils The results showed that when the AN of soil was <100, 100-130, 130-150 and> 150 mg / kg, the recommended N application rates were 150-165 and 135 ~ 150-120-135 and 0-120 kg / hm2, respectively. The recommended P2O5 concentrations were 90-105 and 80-90, respectively, when available phosphorus (AP) was <3,3-4,4 and 6 mg / kg, 45 ~ 80 and 0-45kg / hm2. The K2O recommended rates were 75 ~ 80 and 70 ~ 75 respectively when available potassium was <60, 60-70, 70-90 and> 90mg / 60-70 and 0-60 kg / hm2.