旱育秧水稻不同生育期灌溉指标的研究

IRRIGATION INDICES AT DIFFERENT GROWTH AND DEVELOPMENT STAGE IN DRY -RAISED SEEDLING RICE

以汕优63 和镇稻88 为材料,苗期旱育,本田期分成分蘖期、分蘖末期、拔节～抽穗期、灌浆前期和灌浆后期5个时期,各时期设置土壤水势0 (CK)、- 15、- 30、- 45 和- 60 kPa 5 级水分处理,观察了各生育期不同处理的产量。依据研究结果, 提出了旱育秧水稻各生育期的适宜土壤水势指标; 分蘖期和拔节～抽穗期为0～- 15 kPa,分蘖末期为- 15～- 45 kPa,结实期为- 15～- 30 kPa; 和各生育期灌溉的土壤水势下限指标: 分蘖期和拔节～抽穗期为- 15～- 30 kPa,灌浆前期为- 30 kPa, 分蘖末期和灌浆后期为- 30～- 45 kPa。

With Shanyou 63 (an Indica hydrid rice combination) and Zhendao 88 (a Japonica variety) as materials, the seedlings were raised in a dry land, and the whole growth period in paddy field divided into 5 stages of tillering, last tillering, jointing^heading, early filling and late filling, and 5 levels of soil water potential (SWP) were designed at each stage, i.e. 0 (CK), -15, -30, -45 and -60 kPa, and the grain yield of each treatment was observed. Based on experimental results, both the suitable and low limit indices of irrigation at each growth and development stage in dry raised seedling rice were produced. The suitable indices (SWP) were 0^-15 kPa at tillering and jointing^heading stage, -15^-45 kPa at last tillering stage, and -15^-30 kPa at grain filling stage, and the low limit onces were -15^-30 kPa at tillering and Jointing^heading stage, -30 kPa at early filling stage, and -30^-45 kPa at last tillering and late filling stage.