In India, horse gram [Macrotyloma uniflorum (Lam.) Verdc.] is generally preferred as a contingent crop when the onset of rain is delayed or region-specific popular crops fail to establish due to early season drought. The uncertain and delayed rainfall very often forces farmers to plant horse gram beyond the recommended month of sowing (September). The productivity of horse gram significantly reduces with delayed sowing. Taking cues from other legumes, we hypothesized that genotypes with in-determinate growth habit perform better and are more stable than those with semi-determinate and determinate growth habits across delayed dates of sowing. To test this hypothesis, we assessed comparative grain yield potential based on best linear unbiased predictor and yield relative to environment maximum, and additive main effects and multiplicative interaction model-based stability of horse gram genotypes differing in growth habit across early (August), recommended (September) and delayed (October) dates of sowing. The genotypes with in-determinate and semi-determinate growth habits produced greater grain yield plant⁻¹ when sown during early and recommended months, respectively. The genotypes, irrespective of their growth habit produced comparable grain yield plant⁻¹ when sown during delayed month. However, across-dates of sowing, the average seed yield and stability of in-determinate genotypes were significantly better than semi-determinate and determinate genotypes. Based on YREM estimates, our study indicated that genotypes with semi-determinate growth habit should be preferred over those with other growth habits even for early or delayed sowing due to low grain yield penalty caused by crossover genotypes × dates of sowing interaction.

在印度，马克[ Macrotyloma uniflorum当降雨开始延迟或由于早期干旱导致特定地区的流行农作物无法生长时，（首选）（杂种）通常是首选的特有作物。降雨的不确定性和延迟通常迫使农民在建议的播种月份（9月）之后种植马克。延迟播种会显着降低马克的生产率。从其他豆科植物获得的线索，我们假设具有不确定的生长习性的基因型在播种延迟日期比具有半确定的和决定性的生长习性的基因型表现更好，更稳定。为了验证这一假设，我们根据最佳线性无偏预测因子和相对于环境最大值的产量评估了比较谷物的潜在产量，在早期（8月），推荐（9月）和延迟（10月）播种期间生长习惯不同的马克基因型，其附加主效应和基于乘法相互作用模型的稳定性。具有不确定的和半确定的生长习性的基因型产生更大的谷物产量植物^-1，分别在早期和推荐月份播种。基因型，不论其生长习性如何，在延迟月份播种时都可产生可比的粮食产量植物^-1。然而，在播种的整个日期中，不确定基因型的平均种子产量和稳定性显着优于半确定基因型和确定基因型。基于YREM的估算，我们的研究表明，即使是早期播种或延迟播种，由于交叉基因型×播种日期的交互作用导致的谷物单产低下，即使是早播或延后播种，具有半确定性生长习性的基因型也应优先于具有其他生长习性的基因型。